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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-3-24 on page 377.
%%
%% 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{pstricks,pst-tree,amsmath}
\StopShownPreambleCommands
\begin{document}
\pstree[nodesepB=3pt,arrows=->,levelsep=2cm]{%
\Tdia{\begin{tabular}{c}o|o\\\_\end{tabular}}}{%
\TR[edge={\ncbar[angle=180,armB=0.3cm]}]{x}
\TR{y}
\TR[edge={\ncbar[armB=0.3cm]}]{z}
}
\end{document}
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