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%%
%% 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}
\[\begin{xy} 0;<5mm,0mm>:
0*{DL} ,(2,0)*{DR} ,<0cm,1cm>*{UL} ,(2,2)*{UR}
,0+(4,0)="NO"*{\mathtt{DL}}
,"NO"+(2,2)="SUR"*{\mathtt{UR}}
,"SUR"-<1cm,0cm>*{\mathtt{UL}}
,"SUR"-(0,2)*{\mathtt{DR}}
\end{xy}\]
\end{document}
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