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%% 
%%  Ein Beispiel der DANTE-Edition
%% 
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{142.324pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pst-tree,amsmath}
\StopShownPreambleCommands
\begin{document}
\pstree[nodesepB=3pt,arrows=->,levelsep=2cm]{%
  \Tdia{$\substack{o|o\\\_}$}}{%
    \TR[edge={\ncbar[angle=180,armB=0.3cm]}]{$x$}
    \TR{$y$}
    \TR[edge={\ncbar[armB=0.3cm]}]{$z$}}
\end{document}