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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 7-4-5 on page 482.
%%
%% 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{159.83385pt}
\StartShownPreambleCommands
\usepackage{diagxy}
\StopShownPreambleCommands
\begin{document}
\[\bfig
\square/>>`>`>` >->/[X_1`X_2`X_3`X_4;a`b`c`d]
\morphism(500,500)|m|/.>/<-500,-500>[X_2`X_3;z]
\efig\]
\end{document}
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