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\documentclass{ppex} \nonstopmode \usepackage {xy} \pagestyle{empty} \setlength\textwidth{207.0pt} \begin{document} \ResetPreambleCommands \ReadyForTheFray \usepackage {xy} \[\begin{xy} 0*{DL} ,+/r1cm/*{DR} ,<0cm,1cm>*{UL} ,<1cm,1cm>*{UR} ,(5,5)*{5,5} \end{xy}\] \end{document}