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+%% 
+%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
+%% 
+%%  Example 7-4-12 on page 485.
+%% 
+%%  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[matrix,curve,arrow,tips,frame]{xy}
+\StopShownPreambleCommands
+\begin{document}
+\[\UseTips
+\entrymodifiers={++[o][F]}
+\xymatrix @-1mm {
+ *+\txt{in} \ar[r]
+& 1 \ar@(dr,dl)[]^b \ar[r]_a
+& 2 \ar@(d,dl)[]^a  \ar[r]_b
+& 3 \ar `u[l] `^d[l]_a [l] \ar[r]_b
+& *++[o][F=]{4}
+  \ar `dl_l[ll]+/d6mm/`l_ul[ll]^a [ll]
+  \ar `u^l[lll]+/u1cm/`l^d[lll]_b [lll]
+}\]
+\end{document}