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\documentclass{ppex}
\nonstopmode
\usepackage [all,arc,dvips]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,arc,dvips]{xy}
\[\begin{xy} 0;/r12mm/:
   {\ar@{.>} 0;(1,0)}
  ,{\ar@{.>} 0;(0,1)}
  ,(0,0)*@{*}="c",*+!RU{c}
  ,(1.2,0.8)*@{o}="p",*+!LD{p}
  ,"p";"c"**@{--}
  ,{\ellipse(1.1,.6){}}
  ,{\ellipse(,0.8){}}
  ,{\ellipse<6mm,4mm>{=}}
  ,{\ellipse<,5mm>{--}}
\end{xy}\]
\end{document}