%% 
%%  An UIT Edition example
%% 
%%  Example 09-19-1 on page 195.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  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.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{177.70511pt}
\AtBeginDocument{\setlength\parindent{0pt}}
\setcounter{equation}{31}
\renewcommand\theequation{9.\arabic{equation}}
\StartShownPreambleCommands
\usepackage{xypic}
\StopShownPreambleCommands
\begin{document}
\begin{equation}
\xymatrix{%
A\POS[];[d]**\dir{~},[];[dr]**\dir{-} & B & C\\
D & E\POS[];[l]**\dir{.},[];[r]**\dir{~}
  & F\POS[];[dl]**\dir{~}\\
G & H & I}
\end{equation}
\end{document}