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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 7-4-39 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,graph,dvips]{xy}
\StopShownPreambleCommands
\begin{document}
\[\xygraph{!{0;/r10mm/:}
!{\vover}
[u] !{\hcap[-2]}
[d] !{\vover-}
[ruu] !{\hcap[2]}
}\]
\[\begin{xy} 0;/r10mm/:
,\hcap[-2]\vunder\vunder-
,+(1,2),\hcap[2]
\end{xy}\]
\end{document}
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