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\documentclass{ppex}
\nonstopmode
\usepackage [all,web]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,web]{xy}
\[\renewcommand{\latticebody}{\drop@{o}}
\begin{xy}
*\xybox{0;<5mm,2mm>:<2mm,5mm>::
,0,{\xylattice{-3}{3}{-3}{3}}}="S"
,{"S"+L \ar "S"+R*+!L{z_1}}
,{"S"+D \ar "S"+U*+!D{z_2}}
\end{xy}\]
\end{document}
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