%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 7-4-38 on page 505.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.83385pt}
\StartShownPreambleCommands
\usepackage[all,poly,knot,dvips]{xy}
\StopShownPreambleCommands
\begin{document}
\[\UseTips
\renewcommand{\labelstyle}{\scriptscriptstyle}
\begin{xy} /r9mm/:
 ,(0,0)
 ,{\hunder<><{1}|>|{2}>>>{3}%
    \htwist<<<{4}|>|{5}><>{6}%
     \hloop<><{7}|>|{8}>>>{9}}
 ,(0,-3)
 ,{\hunder<(+0.1)><{1}|>|{2}>>>{3}%
    \htwist<<<{4}|(-.2)>|(-.2){^{5}}><>{6}%
     \hloop<(+.1)><{7}|>|{8}>>>(-.1){9}}
\end{xy}\]
\end{document}