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%% 
%%  A DANTE-Edition example
%% 
%%  Example 16-04-5 on page 243.
%% 
%%  Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{153.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks,pst-node}

\begin{document}
\begin{pspicture}(2.75,3)
  \rput(1.5,2.8){\ovalnode{A}{root}}
  \rput[lb](0,0){\ovalnode{B}{1}}
  \rput[b](1.5,0){\ovalnode{C}{2}}
  \rput[rb](3,0){\ovalnode{D}{3}}
  \ncline{->}{A}{B}\ncline{->}{A}{C}\ncline{->}{A}{D}
\end{pspicture}
\end{document}