<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 [arrow]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [arrow]{xy}
\[\begin{xy}
  (0,-20)="a", (0,0)="b"
  \ar@{&lt;.||}  @&lt;24mm&gt;  "a";"b"
  \ar@^{&lt;.||} @&lt;16mm&gt;  "a";"b"
  \ar@_{&lt;.||} @&lt;8mm&gt;   "a";"b"
  \ar@0{&lt;.||}          "a";"b"
  \ar@1{&lt;.||} @&lt;-8mm&gt;  "a";"b"
  \ar@2{&lt;.||} @&lt;-16mm&gt; "a";"b"
  \ar@3{&lt;.||} @&lt;-24mm&gt; "a";"b"
  \end{xy}\]
\end{document}
</pre></body></html>