/usr/share/doc/racket/games/Tests.html is in racket-doc 6.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>1.18.9 Tests</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Games:<span class="mywbr"> </span> Fun Examples</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="bundled.html" class="tocviewselflink" data-pltdoc="x">Bundled Games</a></td></tr><tr><td align="right">2 </td><td><a href="new-games.html" class="tocviewlink" data-pltdoc="x">Implementing New Games</a></td></tr><tr><td align="right">3 </td><td><a href="Showing_Scribbled_Help.html" class="tocviewlink" data-pltdoc="x">Showing Scribbled Help</a></td></tr><tr><td align="right">4 </td><td><a href="Showing_Text_Help.html" class="tocviewlink" data-pltdoc="x">Showing Text Help</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">►</a></td><td>1 </td><td><a href="bundled.html" class="tocviewlink" data-pltdoc="x">Bundled Games</a></td></tr></table><div class="tocviewsublist" style="display: none;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.1 </td><td><a href="aces.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="aces.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Aces</span> —<wbr></wbr> Solitaire Card Game</a></td></tr><tr><td align="right">1.2 </td><td><a href="gofish.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gofish.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Go Fish</span> —<wbr></wbr> Kid’s Card Game</a></td></tr><tr><td align="right">1.3 </td><td><a href="crazy8s.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="crazy8s.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Crazy 8s</span> —<wbr></wbr> Card Game</a></td></tr><tr><td align="right">1.4 </td><td><a href="blackjack.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="blackjack.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Blackjack</span> —<wbr></wbr> 21 Card Game</a></td></tr><tr><td align="right">1.5 </td><td><a href="ginrummy.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="ginrummy.png" alt="" width="28" height="32"/></span> <span class="ssansserif">Rummy</span> —<wbr></wbr> Card Game</a></td></tr><tr><td align="right">1.6 </td><td><a href="spider.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="spider.png" alt="" width="24" height="32"/></span> <span class="ssansserif">Spider</span> —<wbr></wbr> Solitaire Card Game</a></td></tr><tr><td align="right">1.7 </td><td><a href="memory.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="memory.png" alt="" width="26" height="32"/></span> <span class="ssansserif">Memory</span> —<wbr></wbr> Kid’s Game</a></td></tr><tr><td align="right">1.8 </td><td><a href="slidey.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="slidey.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Slidey</span> —<wbr></wbr> Picture Puzzle</a></td></tr><tr><td align="right">1.9 </td><td><a href="same.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="same.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Same</span> —<wbr></wbr> Dot-<wbr></wbr>Removing Game</a></td></tr><tr><td align="right">1.10 </td><td><a href="mines.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="mines.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Minesweeper</span> —<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.11 </td><td><a href="paint-by-numbers.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="paint-by-numbers.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Paint By Numbers</span> —<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.12 </td><td><a href="lights-out.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="lights-out.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Lights Out</span> —<wbr></wbr> Logic Game</a></td></tr><tr><td align="right">1.13 </td><td><a href="pousse.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="pousse.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Pousse</span> —<wbr></wbr> Tic-<wbr></wbr>Tac-<wbr></wbr>Toe-<wbr></wbr>like Game</a></td></tr><tr><td align="right">1.14 </td><td><a href="gobblet.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gobblet.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Gobblet</span> —<wbr></wbr> Strategy Game</a></td></tr><tr><td align="right">1.15 </td><td><a href="jewel.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="jewel.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Jewel</span> —<wbr></wbr> 3-<wbr></wbr>D Skill Game</a></td></tr><tr><td align="right">1.16 </td><td><a href="parcheesi.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="parcheesi.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Parcheesi</span> —<wbr></wbr> Board Game</a></td></tr><tr><td align="right">1.17 </td><td><a href="checkers.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="checkers.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Checkers</span> —<wbr></wbr> Board Game</a></td></tr><tr><td align="right">1.18 </td><td><a href="chat-noir.html" class="tocviewselflink" data-pltdoc="x"><span class="noborder"><img src="chat-noir.png" alt="" width="40" height="19"/></span> <span class="ssansserif">Chat Noir</span> —<wbr></wbr> Puzzle Game</a></td></tr><tr><td align="right">1.19 </td><td><a href="tally-maze.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="tally-maze.png" alt="" width="32" height="32"/></span> <span class="ssansserif">Tally Maze</span> —<wbr></wbr> Maze Enumeration Game</a></td></tr><tr><td align="right">1.20 </td><td><a href="gcalc.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="gcalc.png" alt="" width="32" height="32"/></span> <span class="ssansserif">GCalc</span> —<wbr></wbr> Visual λ-<wbr></wbr>Calculus</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_2");">▼</a></td><td>1.18 </td><td><a href="chat-noir.html" class="tocviewlink" data-pltdoc="x"><span class="noborder"><img src="chat-noir.png" alt="" width="40" height="19"/></span> <span class="ssansserif">Chat Noir</span> —<wbr></wbr> Puzzle Game</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_2"><table cellspacing="0" cellpadding="0"><tr><td align="right">1.18.1 </td><td><a href="Overview.html" class="tocviewlink" data-pltdoc="x">Overview</a></td></tr><tr><td align="right">1.18.2 </td><td><a href="The_World.html" class="tocviewlink" data-pltdoc="x">The World</a></td></tr><tr><td align="right">1.18.3 </td><td><a href="Breadth-first_Search.html" class="tocviewlink" data-pltdoc="x">Breadth-<wbr></wbr>first Search</a></td></tr><tr><td align="right">1.18.4 </td><td><a href="Board_to_Graph.html" class="tocviewlink" data-pltdoc="x">Board to Graph</a></td></tr><tr><td align="right">1.18.5 </td><td><a href="The_Cat_s_Path.html" class="tocviewlink" data-pltdoc="x">The Cat’s Path</a></td></tr><tr><td align="right">1.18.6 </td><td><a href="Drawing_the_Cat.html" class="tocviewlink" data-pltdoc="x">Drawing the Cat</a></td></tr><tr><td align="right">1.18.7 </td><td><a href="Drawing_the_World.html" class="tocviewlink" data-pltdoc="x">Drawing the World</a></td></tr><tr><td align="right">1.18.8 </td><td><a href="Handling_Input.html" class="tocviewlink" data-pltdoc="x">Handling Input</a></td></tr><tr><td align="right">1.18.9 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Tests</a></td></tr><tr><td align="right">1.18.10 </td><td><a href="Run__program__run.html" class="tocviewlink" data-pltdoc="x">Run, program, run</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3ctest-infrastructure~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><test-infrastructure></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3clookup-in-table-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><lookup-in-table-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cbuild-bfs-table-tests~3e~3a2%29%29" class="plainlink" data-pltdoc="x"><build-bfs-table-tests><span style="vertical-align: sub; font-size: 80%">2</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cneighbors-tests~3e~3a4%29%29" class="plainlink" data-pltdoc="x"><neighbors-tests><span style="vertical-align: sub; font-size: 80%">4</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cadjacent-tests~3e~3a2%29%29" class="plainlink" data-pltdoc="x"><adjacent-tests><span style="vertical-align: sub; font-size: 80%">2</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3con-boundary~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><on-boundary?-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cin-bounds~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><in-bounds?-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3con-cats-path~3f-tests~3e~3a2%29%29" class="plainlink" data-pltdoc="x"><on-cats-path?-tests><span style="vertical-align: sub; font-size: 80%">2</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3c%2B%2Ff-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><+/f-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cworld-size-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><world-size-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3ccell-center-x-tests~3e~3a3%29%29" class="plainlink" data-pltdoc="x"><cell-center-x-tests><span style="vertical-align: sub; font-size: 80%">3</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3ccell-center-y-tests~3e~3a2%29%29" class="plainlink" data-pltdoc="x"><cell-center-y-tests><span style="vertical-align: sub; font-size: 80%">2</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cclack-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><clack-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cupdate-world-posn-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><update-world-posn-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cmove-cat-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><move-cat-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cchange-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><change-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cpoint-in-this-circle~3f-tests~3e~3a3%29%29" class="plainlink" data-pltdoc="x"><point-in-this-circle?-tests><span style="vertical-align: sub; font-size: 80%">3</span></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cfind-best-positions-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><find-best-positions-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3clt%2Ff-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><lt/f-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3ccircle-at-point-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><circle-at-point-tests></a></span></td></tr><tr><td><span class="Smaller"><a href="#%28elem._%28chunk._~3cblocked-cells-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><blocked-cells-tests></a></span></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="Handling_Input.html" title="backward to "1.18.8 Handling Input"" data-pltdoc="x">← prev</a> <a href="chat-noir.html" title="up to "1.18 Chat Noir --- Puzzle Game"" data-pltdoc="x">up</a> <a href="Run__program__run.html" title="forward to "1.18.10 Run, program, run"" data-pltdoc="x">next →</a></span> </div><h5 x-source-module="(lib "games/scribblings/games.scrbl")" x-source-pkg="games" x-part-tag=""Tests"">1.18.9<tt> </tt><a name="(part._.Tests)"></a>Tests</h5><p>This section consists of some infrastructure for
maintaining tests, plus a pile of additional tests
for the other functions in this document.</p><p>The <span class="RktSym">test</span> and <span class="RktSym">test/set</span> macros
package up their arguments into thunks and then
simply call <span class="RktSym">test/proc</span>, supplying
information about the source location of the test
case. The <span class="RktSym">test/proc</span> function runs the tests
and reports the results.</p><p><div class="SIntrapara"><a name="(elem._(chunk._~3ctest-infrastructure~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3ctest-infrastructure~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><test-infrastructure></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define-syntax%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define-syntax</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529._syntax-case%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">syntax-case</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529.__%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">_</a></span><span class="hspace"> </span><span class="RktSym">actual</span><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529._with-syntax%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">with-syntax</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stxops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._syntax-line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">syntax-line</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">pos</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stxops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._syntax-position%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">syntax-position</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktPn">(</span><span class="RktSym">test/proc</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">actual</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=booleans.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._equal%7E3f%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">equal?</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">actual</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define-syntax%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define-syntax</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529._syntax-case%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">syntax-case</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">[</span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529.__%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">_</a></span><span class="hspace"> </span><span class="RktSym">actual</span><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stx-patterns.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fstxcase-scheme..rkt%2529._with-syntax%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">with-syntax</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">[</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stxops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._syntax-line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">syntax-line</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="RktPn">]</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">[</span><span class="RktSym">pos</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=stxops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._syntax-position%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">syntax-position</a></span><span class="hspace"> </span><span class="RktSym">stx</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktRdr">#'</span><span class="RktPn">(</span><span class="RktSym">test/proc</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">actual</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym">y</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktSym">x</span><span class="hspace"> </span><span class="RktSym">y</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">actual</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">]</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">test-count</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">test/proc</span><span class="hspace"> </span><span class="RktSym">actual-thunk</span><span class="hspace"> </span><span class="RktSym">expected-thunk</span><span class="hspace"> </span><span class="RktSym">cmp</span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span><span class="hspace"> </span><span class="RktSym">sexp</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=set_.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._set%2521%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">set!</a></span><span class="hspace"> </span><span class="RktSym">test-count</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252B%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktSym">test-count</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">actual</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">actual-thunk</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktSym">expected</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">expected-thunk</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=when_unless.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fletstx-scheme..rkt%2529._unless%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">unless</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cmp</span><span class="hspace"> </span><span class="RktSym">actual</span><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=exns.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._error%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">error</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">check-expect</span><span class="hspace"> </span><span class="RktVal">"test #~a~a\n</span><span class="hspace"> </span><span class="RktVal">~s\n</span><span class="hspace"> </span><span class="RktVal">~s\n"</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">test-count</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=if.html%23%2528form._%2528%2528quote._%7E23%7E25kernel%2529._if%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">if</a></span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Writing.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._format%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">format</a></span><span class="hspace"> </span><span class="RktVal">" on line ~a failed:"</span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=teachpack&rel=2htdpimage.html%23%2528def._%2528%2528lib._2htdp%252Fimage..rkt%2529._line%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">line</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=Writing.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._format%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">format</a></span><span class="hspace"> </span><span class="RktVal">" failed: ~s"</span><span class="hspace"> </span><span class="RktSym">sexp</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">actual</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">expected</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=define.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._define%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">define</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktSym">l1</span><span class="hspace"> </span><span class="RktSym">l2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=if.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fletstx-scheme..rkt%2529._and%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">and</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fmap..rkt%2529._andmap%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">andmap</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">e1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._member%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">member</a></span><span class="hspace"> </span><span class="RktSym">e1</span><span class="hspace"> </span><span class="RktSym">l2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">l1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fmap..rkt%2529._andmap%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">andmap</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=lambda.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._%7Ece%7Ebb%2529%2529&version=6.7" class="RktStxLink Sq" data-pltdoc="x">λ</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">e2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._member%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">member</a></span><span class="hspace"> </span><span class="RktSym">e2</span><span class="hspace"> </span><span class="RktSym">l1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">l2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">same-sets?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3clookup-in-table-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3clookup-in-table-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><lookup-in-table-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">lookup-in-table</span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Flist..rkt%2529._empty%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">empty</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">lookup-in-table</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">lookup-in-table</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cbuild-bfs-table-tests~3e~3a2))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Breadth-first_Search.html#%28elem._%28chunk._~3cbuild-bfs-table-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><build-bfs-table-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">block-cell</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test/set</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-dist-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">lookup-in-table</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">build-bfs-table</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cneighbors-tests~3e~3a4))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Board_to_Graph.html#%28elem._%28chunk._~3cneighbors-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><neighbors-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">neighbors</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-world</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">adjacent</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">neighbors</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-world</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">adjacent</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">neighbors</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-world</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">neighbors</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">neighbors</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">boundary</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cadjacent-tests~3e~3a2))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Board_to_Graph.html#%28elem._%28chunk._~3cadjacent-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><adjacent-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">adjacent</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">adjacent</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3con-boundary~3f-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3con-boundary~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><on-boundary?-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">12</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">12</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">on-boundary?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">10</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">13</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cin-bounds~3f-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cin-bounds~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><in-bounds?-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">10</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal"><span class="nobreak">-1</span></span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal"><span class="nobreak">-1</span></span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">11</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">10</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">in-bounds?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">10</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">11</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3con-cats-path~3f-tests~3e~3a2))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="The_Cat_s_Path.html#%28elem._%28chunk._~3con-cats-path~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><on-cats-path?-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">on-cats-path?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">on-cats-path?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">on-cats-path?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">empty-board</span><span class="hspace"> </span><span class="RktVal">5</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">5</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktPn">(</span><span class="RktSym">on-cats-path?</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3c+/f-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3c%2B%2Ff-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><+/f-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">+/f</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">+/f</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">+/f</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">+/f</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cworld-size-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cworld-size-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><world-size-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">world-width</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">150</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">world-height</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">117</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3ccell-center-x-tests~3e~3a3))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Drawing_the_World.html#%28elem._%28chunk._~3ccell-center-x-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><cell-center-x-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktSym">circle-radius</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252B%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252A%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktSym">circle-spacing</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">circle-radius</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252B%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252A%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktSym">circle-spacing</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktSym">circle-radius</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3ccell-center-y-tests~3e~3a2))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Drawing_the_World.html#%28elem._%28chunk._~3ccell-center-y-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><cell-center-y-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252B%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">+</a></span><span class="hspace"> </span><span class="RktSym">circle-radius</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=generic-numbers.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._%252A%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">*</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktSym">circle-spacing</span><span class="hspace"> </span><span class="RktVal">433/500</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cclack-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cclack-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><clack-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">"button-down"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">drag</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">move</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">enter</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">leave</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">10</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">10</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"button-down"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"button-up"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">10</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">10</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"button-up"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"button-up"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">clack</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"button-up"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-won</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cupdate-world-posn-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cupdate-world-posn-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><update-world-posn-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">update-world-posn</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">update-world-posn</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">update-world-posn</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cmove-cat-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cmove-cat-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><move-cat-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">move-cat</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">4</span><span class="hspace"> </span><span class="RktVal">4</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">5</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cchange-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cchange-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><change-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">change</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"h"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">change</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"h"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">change</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"n"</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">world-state</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">change</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-world</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">(</span><span class="RktVal">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">cat-lost</span><span class="hspace"> </span><span class="RktVal">3</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">"n"</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">playing</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cpoint-in-this-circle~3f-tests~3e~3a3))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="Handling_Input.html#%28elem._%28chunk._~3cpoint-in-this-circle~3f-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><point-in-this-circle?-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">point-in-this-circle?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">point-in-this-circle?</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cfind-best-positions-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cfind-best-positions-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><find-best-positions-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">find-best-positions</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3clt/f-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3clt%2Ff-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><lt/f-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><=/f</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><=/f</span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><=/f</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><=/f</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><=/f</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="hspace"> </span><span class="RktVal">'</span><span class="RktVal">∞</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3ccircle-at-point-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3ccircle-at-point-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><circle-at-point-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">circle-at-point</span><span class="hspace"> </span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528lib._racket%252Flist..rkt%2529._empty%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">empty</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">circle-at-point</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">circle-at-point</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-x</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">cell-center-y</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">circle-at-point</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><p><div class="SIntrapara"><a name="(elem._(chunk._~3cblocked-cells-tests~3e~3a1))"></a><span style="font-weight: bold"><span style="font-style: italic"><a href="#%28elem._%28chunk._~3cblocked-cells-tests~3e~3a1%29%29" class="plainlink" data-pltdoc="x"><blocked-cells-tests></a></span> ::=</span></div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">block-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktVal">1</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">2</span><span class="hspace"> </span><span class="RktVal">2</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">add-n-random-blocked-cells</span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="RktPn">(</span><span class="RktSym">test</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">add-n-random-blocked-cells</span><span class="hspace"> </span><span class="RktVal">1</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">#f</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVal">3</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=pairs.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._list%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">list</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">make-cell</span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=htdp&rel=index.html%23%2528def._%2528%2528lib._lang%252Fposn..rkt%2529._make-posn%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">make-posn</a></span><span class="hspace"> </span><span class="RktVal">0</span><span class="hspace"> </span><span class="RktVal">0</span><span class="RktPn">)</span><span class="hspace"> </span><span class="RktVal">#t</span><span class="RktPn">)</span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div></p><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="Handling_Input.html" title="backward to "1.18.8 Handling Input"" data-pltdoc="x">← prev</a> <a href="chat-noir.html" title="up to "1.18 Chat Noir --- Puzzle Game"" data-pltdoc="x">up</a> <a href="Run__program__run.html" title="forward to "1.18.10 Run, program, run"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
|