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%%
%% A DANTE-Edition example
%%
%% Example 16-10-2 on page 264.
%%
%% 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{375.57637pt}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-node}
\begin{document}
\begin{pspicture}(10,5)
\pnode(0,3){V}
\cnode(1.5,3){0.25cm}{K1}
\fnode[framesize=1.5cm](4,3){G1}\rput(4,3){\Large $G_1$}
\fnode[framesize=1.5cm](4,1){G2}\rput(4,1){\Large $G_2$}
\cnode*(6.5,3){0.1cm}{K2}
\pnode(8,3){X}
\psset{linewidth=1.5pt,arrows=->}
\ncline{V}{K1}\naput{\Large V}
\ncline{K1}{G1}
\ncline{G1}{X}\naput[npos=0.75]{\Large X}
\ncangle[angleA=-90,angleB=0]{K2}{G2}
\ncangle[angleA=180,angleB=-90]{G2}{K1}
\nbput[npos=2.5]{\textbf{\Large -}}
\end{pspicture}
\end{document}
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