<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 7-2-2 on page 470.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.83385pt}
\StartShownPreambleCommands
\usepackage{xy}
\StopShownPreambleCommands
\begin{document}
\[\begin{xy} 0;&lt;5mm,0mm&gt;:
 0*{DL} ,(2,0)*{DR} ,&lt;0cm,1cm&gt;*{UL} ,(2,2)*{UR}
 ,0+(4,0)="NO"*{\mathtt{DL}}
 ,"NO"+(2,2)="SUR"*{\mathtt{UR}}
 ,"SUR"-&lt;1cm,0cm&gt;*{\mathtt{UL}}
 ,"SUR"-(0,2)*{\mathtt{DR}}
\end{xy}\]
\end{document}
</pre></body></html>