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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 7-4-40 on page 506.
%%
%% 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{207.83385pt}
\StartShownPreambleCommands
\usepackage[curve,knot,arrow,dvips]{xy}
\StopShownPreambleCommands
\begin{document}
\[\renewcommand{\labelstyle}{\scriptstyle}
\begin{xy} 0;/r8mm/:
,{\xcapv-|{a}}
, +(0,1) ,{\xcaph|{b}\xunderh|{c}%
\xcaph|{d}\xcapv|{e}}
,-(3,0),{\xoverh|{f}}
,+(1,0),{\xoverh|{g}}
,-(3,1),{\xcapv-|{h}\xcaph-|{i}}
,+(0,1),{\xunderh-|{j}}
,+(0,-1),{\xcaph-|{k}}
,+(0,1),{\xcapv|{l}}
\end{xy}\]
\end{document}
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