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%Latex
\documentstyle[fleqn,psfig,12pt,pstricks,pst-node,pst-tree]{article}
%\documentclass[fleqn,12pt]{article}
%\usepackage{pstricks,pst-node,pst-tree}
%latex2e
%\documentclass{article}
%\usepackage{epsfig,alltt,fancybox}
\setlength{\textwidth}{6.5in}
\setlength{\oddsidemargin}{0in}
\setlength{\textheight}{8.5in}
\setlength{\headheight}{0in}
\setlength{\headsep}{-0.5in}
\setlength{\parindent}{0in} % block style
\setlength{\parskip}{0.3cm}
\newcommand{\mytitle}[1]{\newpage \huge \begin{center}#1\vspace{0.8cm}\end{center} \LARGE}
\begin{document}
\mytitle{Hello world}
Hello world
\centering
$
\pstree[treemode=R]{\Tcircle{b}}{%
\pstree{\TC*^{a_1}}{%
\Tr{b_{11}}^{x_1}
\Tr{b_{12}}_{x_2}
}
\pstree{\TC*_{a_2}}{%
\Tr{b_{21}}^{x_1}
\Tr{b_{22}}_{x_2}
}
}
$
\mytitle{Hello world 2}
\psline[linewidth=0.5cm](0,0)(2,0)
\psline[linewidth=0.05cm](2,-1)(6,-1)
\end{document}
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