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%% 
%%  A DANTE-Edition example
%% 
%%  Example 16-02-7 on page 230.
%% 
%%  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}
\Cnode[radius=.3cm](.25,0){A}
\Cnode[radius=.3cm](2.5,0){B}
\ncangle[angleA=45,angleB=135]{->}{A}{B}%
\nccurve[angleB=-45,angleA=-135]{->}{B}{A}
\par\vspace{1cm}
\Cnode[radius=.3cm](.25,0){A}
\Cnode[radius=.3cm](2.5,0){B}
\nccurve[angle=30]{->}{A}{B}
\nccurve[angleB=-45,angleA=-135]{->}{B}{A}
\end{document}