/usr/share/texmf-texlive/tex/generic/genmisc/laps.tex is in texlive-generic-recommended 2009-15.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | %%% File: Laps.TeX
\catcode`\@=11 % Let's pretend @ is a letter
% Vertical `laps'; cf. \llap and \rlap
\long\def\ulap#1{\vbox to \z@{\vss#1}}
\long\def\dlap#1{\vbox to \z@{#1\vss}}
% And centered horizontal and vertical `laps'
\def\xlap#1{\hbox to \z@{\hss#1\hss}}
\long\def\ylap#1{\vbox to \z@{\vss#1\vss}}
% And a `lap' centered on its midpoint
\long\def\zlap#1{\ylap{\xlap{#1}}}
\catcode`\@=12 % That's enough pretending for one day.
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