<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\documentclass{ppex}
\nonstopmode
\usepackage [all,arc,dvips]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,arc,dvips]{xy}
\[\begin{xy} /r12mm/:
   (0,0)*@{*}="c",*++++!R{c}
  ,(1.2,.8)*+[F]@{+}="p"
  ,*++!LD{p},"p";"c"**@{--}
  ,{\ellipse&lt;&gt;{}}
  ,{\ellipse(0.8){}}
  ,0;(-1,1)::
  ,{\ar@{.&gt;} 0;(1,0)}
  ,{\ar@{.&gt;} 0;(0,1)}
  ,"p";"c",{\ellipse(.8){--}}
  ,{\ellipse&lt;3mm&gt;{=}}
\end{xy}\]
\end{document}
</pre></body></html>