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\documentclass{minimal}% Uwe Ziegenhagen/Herbert Voss
\usepackage{pstricks}
\usepackage{pst-node}
\usepackage{amsmath}
\parindent=0pt
\pagestyle{empty}
\begin{document}
\begin{psmatrix}[rowsep=.5cm, colsep=2cm]
& & & & empty & \boxed{S_0^{+\dots+}}\\
& & & \boxed{S_0^{+++}} & empty & leer \\
& & \boxed{S_0^{++}} & leer & empty & \boxed{S_0^{+\dots+-}}\\
& \boxed{S_0^+} & leer & \boxed{S_0^{++-}} & empty & leer\\
\boxed{S_0} & leer & \boxed{S_0^{+-}} & leer & empty & \dots\\
& \boxed{S_0^-} & leer & \boxed{S_0^{+--}} & empty & leer\\
& & \boxed{S_0^{--}} & leer & empty & \boxed{S_T^{+\dots-}}\\
& & & \boxed{S_0^{---}} & empty & leer\\
& & & & empty & \boxed{S_T^{-\dots-}}\\
\psset{linewidth=1pt}
\ncline{5,1}{4,2}>{$p$}
\ncline{4,2}{3,3}>{$p$}
\ncline{6,2}{5,3}>{$p$}
\ncline{3,3}{2,4}>{$p$}
\ncline{5,3}{4,4}>{$p$}
\ncline{7,3}{6,4}>{$p$}
\ncline{5,1}{6,2}<{$1-p$}
\ncline{4,2}{5,3}<{$1-p$}
\ncline{6,2}{7,3}<{$1-p$}
\ncline{3,3}{4,4}<{$1-p$}
\ncline{5,3}{6,4}<{$1-p$}
\ncline{7,3}{8,4}<{$1-p$}
\psset{linewidth=0.5pt,linestyle=dotted}
\ncline{2,4}{1,5}
\ncline{2,4}{3,5}
\ncline{4,4}{3,5}
\ncline{4,4}{5,5}
\ncline{6,4}{5,5}
\ncline{6,4}{7,5}
\ncline{8,4}{7,5}
\ncline{8,4}{9,5}
\end{psmatrix}
\end{document}
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