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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>Racket Documentation</title><link rel="stylesheet" type="text/css" href="scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="root-info.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="root-info.js"></script><script type="text/javascript" src="manual-racket.js"></script><script type="text/javascript" src="doc-site.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"><table class="tocsublist" cellspacing="0"><tr><td><a href="index.html" class="tocviewselflink" onclick="return GotoPLTRoot(&quot;6.7&quot;, &quot;index.html&quot;);" data-pltdoc="x"><span class="tocsubseclink">Racket Documentation</span></a></td></tr><tr><td><a href="search/index.html" class="tocviewlink" onclick="return GotoPLTRoot(&quot;6.7&quot;, &quot;search/index.html&quot;);" data-pltdoc="x"><span class="tocsubseclink">Search Manuals</span></a></td></tr><tr><td>&nbsp;</td></tr><tr><td><a href="license/index.html" class="tocviewlink" data-pltdoc="x"><span class="tocsubseclink">License</span></a></td></tr><tr><td><a href="acks/index.html" class="tocviewlink" data-pltdoc="x"><span class="tocsubseclink">Acknowledgements</span></a></td></tr><tr><td><a href="release/index.html" class="tocviewlink" onclick="return GotoPLTRoot(&quot;6.7&quot;, &quot;release/index.html&quot;);" data-pltdoc="x"><span class="tocsubseclink">Release Notes</span></a></td></tr><tr><td>&nbsp;</td></tr><tr><td><a href="http://bugs.racket-lang.org/?v=6.7" class="tocviewlink" data-pltdoc="x"><span class="tocsubseclink">Report a Bug</span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.7</span></div><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, &quot;6.7&quot;, &quot;&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;</span>&nbsp;</div><h2 x-source-module="(lib &quot;scribblings/main/start.scrbl&quot;)" x-source-pkg="racket-index" x-part-tag="&quot;top&quot;"><a name="(part._top)"></a><a name="(part._.Racket_.Documentation)"></a>Racket Documentation</h2><p><script type="text/javascript">
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Programming with Racket</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Racket Language and Core Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="guide/index.html" class="plainlink" data-pltdoc="x"><span style="font-weight: bold">The Racket Guide</span></a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="reference/index.html" class="plainlink" data-pltdoc="x"><span style="font-weight: bold">The Racket Reference</span></a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="pkg/index.html" class="plainlink" data-pltdoc="x">Package Management in Racket</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="draw/index.html" class="plainlink" data-pltdoc="x">The Racket Drawing Toolkit</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="gui/index.html" class="plainlink" data-pltdoc="x">The Racket Graphical Interface Toolkit</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="foreign/index.html" class="plainlink" data-pltdoc="x">The Racket Foreign Interface</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="scribble/index.html" class="plainlink" data-pltdoc="x">Scribble: The Racket Documentation Tool</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="drracket/index.html" class="plainlink" data-pltdoc="x">DrRacket: The Racket Programming Environment</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="raco/index.html" class="plainlink" data-pltdoc="x"><span class="stt">raco</span>: Racket Command-Line Tools</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="style/index.html" class="plainlink" data-pltdoc="x">How to Program 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Language</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="plai/index.html" class="plainlink" data-pltdoc="x"><span style="font-style: italic">Programming Languages: Application and Interpretation</span></a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="picturing-programs/index.html" class="plainlink" data-pltdoc="x"><span style="font-style: italic">Picturing Programs</span> Teachpack</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="deinprogramm/index.html" class="plainlink" data-pltdoc="x">Sprachebenen und Material zu <span style="font-style: italic">Die Macht der Abstraktion</span></a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Other <a href="guide/dialects.html" class="plainlink" data-pltdoc="x">Languages</a> in the Racket Environment </p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="ts-guide/index.html" class="plainlink" data-pltdoc="x">The Typed Racket Guide</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="ts-reference/index.html" class="plainlink" data-pltdoc="x">The Typed Racket Reference</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="r6rs/index.html" class="plainlink" data-pltdoc="x">R6RS: Scheme</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="datalog/index.html" class="plainlink" data-pltdoc="x">Datalog: Deductive Database Programming</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Tools</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="web-server/index.html" class="plainlink" data-pltdoc="x">Web Applications in Racket</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="future-visualizer/index.html" class="plainlink" data-pltdoc="x">Futures 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Presentation Tools</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="web-server-internal/index.html" class="plainlink" data-pltdoc="x">Web Server: HTTP Server</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="tools/index.html" class="plainlink" data-pltdoc="x">DrRacket Plugins</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="drracket-tools/index.html" class="plainlink" data-pltdoc="x">DrRacket Tools</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>GUI and Graphics Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="framework/index.html" class="plainlink" data-pltdoc="x">Framework: Racket GUI Application Framework</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="pict/index.html" class="plainlink" data-pltdoc="x">Pict: Functional Pictures</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="pict-snip/index.html" class="plainlink" data-pltdoc="x">Pict Snip: Build Snips from Picts</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="browser/index.html" class="plainlink" data-pltdoc="x">Browser: Simple HTML Rendering</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="cards/index.html" class="plainlink" data-pltdoc="x">Cards: Virtual Playing Cards Library</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="embedded-gui/index.html" class="plainlink" data-pltdoc="x">Embedded GUI: Widgets Within Editors</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="games/index.html" class="plainlink" data-pltdoc="x">Games: Fun Examples</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="gl-board-game/index.html" class="plainlink" data-pltdoc="x">GL Board Game: 3-D Game Support</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="images/index.html" class="plainlink" data-pltdoc="x">Images</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="plot/index.html" class="plainlink" data-pltdoc="x">Plot: Graph Plotting</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="mrlib/index.html" class="plainlink" data-pltdoc="x">MrLib: Extra GUI Libraries</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="turtles/index.html" class="plainlink" data-pltdoc="x">Turtle Graphics</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="sgl/index.html" class="plainlink" data-pltdoc="x">GL: 3-D Graphics</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="string-constants/index.html" class="plainlink" data-pltdoc="x">String Constants: GUI Internationalization</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="syntax-color/index.html" class="plainlink" data-pltdoc="x">Syntax Color: Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Network Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="distributed-places/index.html" class="plainlink" data-pltdoc="x">Distributed Places</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="openssl/index.html" class="plainlink" data-pltdoc="x">OpenSSL: Secure Communication</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="net/index.html" class="plainlink" data-pltdoc="x">Net: Networking Libraries</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="win32-ssl/index.html" class="plainlink" data-pltdoc="x">Windows Native SSL: Secure Communication</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="osx-ssl/index.html" class="plainlink" data-pltdoc="x">OS X Native SSL: Secure Communication</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="unix-socket/index.html" class="plainlink" data-pltdoc="x">Unix Domain Sockets</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Parsing Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="html/index.html" class="plainlink" data-pltdoc="x">HTML: Parsing Library</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="json/index.html" class="plainlink" data-pltdoc="x">JSON</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="parser-tools/index.html" class="plainlink" data-pltdoc="x">Parser Tools: <span class="stt">lex</span> and <span class="stt">yacc</span>-style Parsing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="file/index.html" class="plainlink" data-pltdoc="x">File: Racket File and Format Libraries</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="xml/index.html" class="plainlink" data-pltdoc="x">XML: Parsing and Writing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Tool Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="dynext/index.html" class="plainlink" data-pltdoc="x">Dynext: Running a C Compiler/Linker</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="macro-debugger/index.html" class="plainlink" data-pltdoc="x">Macro Debugger: Inspecting Macro Expansion</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="make/index.html" class="plainlink" data-pltdoc="x">Make: Dependency Manager</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="readline/index.html" class="plainlink" data-pltdoc="x">Readline: Terminal Interaction</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="errortrace/index.html" class="plainlink" data-pltdoc="x">Errortrace: Debugging and Profiling</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="trace/index.html" class="plainlink" data-pltdoc="x">Trace: Instrumentation to Show Function Calls</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="slatex-wrap/index.html" class="plainlink" data-pltdoc="x">SLaTeX Wrapper</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="test-engine/index.html" class="plainlink" data-pltdoc="x">Test Support</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="version/index.html" class="plainlink" data-pltdoc="x">Version: Racket Version Checking</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="xrepl/index.html" class="plainlink" data-pltdoc="x">XREPL: eXtended REPL</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Low-Level APIs</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="inside/index.html" class="plainlink" data-pltdoc="x">Inside: Racket C API</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Interoperability</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="mzcom/index.html" class="plainlink" data-pltdoc="x">MzCOM: Racket as a Windows COM Object</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Data Structures</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="data/index.html" class="plainlink" data-pltdoc="x">Data: Data Structures</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Databases</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="db/index.html" class="plainlink" data-pltdoc="x">DB: Database Connectivity</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Math and Science</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="math/index.html" class="plainlink" data-pltdoc="x">Math Library</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Performance Tools</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="optimization-coach/index.html" class="plainlink" data-pltdoc="x">Optimization Coach</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="profile/index.html" class="plainlink" data-pltdoc="x">Profile: Statistical Profiler</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="contract-profile/index.html" class="plainlink" data-pltdoc="x">Contract Profiling</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Scribble Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="scriblib/index.html" class="plainlink" data-pltdoc="x">Scriblib: Extra Scribble Libraries</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Syntax Extensions</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="2d/index.html" class="plainlink" data-pltdoc="x">2D Syntax</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="syntax/index.html" class="plainlink" data-pltdoc="x">Syntax: Meta-Programming Helpers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Miscellaneous Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="srfi/index.html" class="plainlink" data-pltdoc="x">SRFIs: Libraries</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="ds-store/index.html" class="plainlink" data-pltdoc="x">Reading Writing <span class="stt">".DS_Store"</span> Files</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="bug-report/index.html" class="plainlink" data-pltdoc="x">Bug Reporting</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="help/index.html" class="plainlink" data-pltdoc="x">Help and Documentation Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="htdp/index.html" class="plainlink" data-pltdoc="x">Implementing HtDP Teachpacks, Libraries, and Customized Teaching Languages</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="option-contract/index.html" class="plainlink" data-pltdoc="x">Option Contracts</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="plt-installer/index.html" class="plainlink" data-pltdoc="x">GUI <span class="stt">".plt"</span> Installer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="stepper/index.html" class="plainlink" data-pltdoc="x">The Stepper</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="swindle/index.html" class="plainlink" data-pltdoc="x">Swindle</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="tool/index.html" class="plainlink" data-pltdoc="x">DrRacket Version Tool</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Experimental Languages and Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="frtime/index.html" class="plainlink" data-pltdoc="x">FrTime: A Language for Reactive Programs</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="lazy/index.html" class="plainlink" data-pltdoc="x">Lazy Racket</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="algol60/index.html" class="plainlink" data-pltdoc="x">Algol 60</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;</span></p></td></tr><tr><td><p>Legacy Languages and Libraries</p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="r5rs/index.html" class="plainlink" data-pltdoc="x">R5RS: Legacy Scheme</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="scheme/index.html" class="plainlink" data-pltdoc="x">Scheme: Compatibility Libraries and Executables</a></p></td></tr><tr><td><p><span class="sepspace">&nbsp;</span></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="compatibility/index.html" class="plainlink" data-pltdoc="x">Compatibility: Features from Racket Relatives</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="mysterx/index.html" class="plainlink" data-pltdoc="x">MysterX: Legacy Support for Windows COM</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="mzscheme/index.html" class="plainlink" data-pltdoc="x">MzScheme: Legacy Language</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="preprocessor/index.html" class="plainlink" data-pltdoc="x"><span class="stt">mzpp</span> and <span class="stt">mztext</span>: Preprocessors</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="mzlib/index.html" class="plainlink" data-pltdoc="x">MzLib: Legacy Libraries</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;</span><a href="graphics/index.html" class="plainlink" data-pltdoc="x">Graphics: Legacy Library</a></p></td></tr></table><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, &quot;6.7&quot;, &quot;&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) 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