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%%
%% The LaTeX Graphics Companion, 2ed (first printing May 2007)
%%
%% Example 6-2-14 on page 341.
%%
%% 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-node}
\StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid=true](3,3)
\rput[bl](0,0){\rnode{A}{Idea 1}}
\rput[tr](3,3){\rnode{B}{Idea 2}}
\ncline[nodesep=3pt,doubleline=true]{<->}{A}{B}
\rput[lt](0,3){\rnode{A}{Idea 3}}
\rput[rb](3,0){\rnode{B}{Idea 4}}
\ncline*[nodesep=3pt,doubleline=true]{<->}{A}{B}
\end{pspicture}
\end{document}
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