%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-3-10 on page 371.
%% 
%%  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{207.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-tree}
\StopShownPreambleCommands
\begin{document}
 \pstree{\Toval{root}}
        {\pstree{\Tcircle{A}}
                {\Tcircle{1}  \Tcircle{2}
                 \Tcircle{3}  \Tcircle{4}
                }
         \pstree[treemode=R]{\Tcircle{B}}
                {\Tcircle{1}  \Tcircle{2}
                 \Tcircle{3}  \Tcircle{4}
                }
        }
\end{document}