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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-2-71 on page 364.
%% 
%%  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{135.83385pt}
\setlength\parindent{0pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-node}
\StopShownPreambleCommands
\begin{document}
$ \begin{psmatrix}[colsep=1cm,mcol=c]
    [name=A,mcol=r] A & [name=X] XxXxX \\[0pt]
    [name=Y] YyYyY    & [name=Z] Z
  \end{psmatrix}
 \psset{nodesep=3pt,arrows=->}
 \ncline{X}{Y}\ncline{X}{Z}\ncline{A}{Y}
 \ncline[linestyle=dotted]{Y}{Z} $
\end{document}