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\documentclass{ppex}
\nonstopmode
\usepackage [all,poly,knot,dvips]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [all,poly,knot,dvips]{xy}
\[\UseTips
\renewcommand{\labelstyle}{\scriptscriptstyle}
\begin{xy} /r9mm/:
,(0,0)
,{\hunder<><{1}|>|{2}>>>{3}%
\htwist<<<{4}|>|{5}><>{6}%
\hloop<><{7}|>|{8}>>>{9}}
,(0,-3)
,{\hunder<(+0.1)><{1}|>|{2}>>>{3}%
\htwist<<<{4}|(-.2)>|(-.2){^{5}}><>{6}%
\hloop<(+.1)><{7}|>|{8}>>>(-.1){9}}
\end{xy}\]
\end{document}
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