%% 
%%  Example 04-01-29 
%%  Copyright (C) 2016 Herbert Voss
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{screxa}
\pagestyle{empty}
\setlength\textwidth{328.62788pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage[all]{xy}
%StopShownPreambleCommands
\begin{document}
\xymatrix{A\POS[];[d]**\dir{~},[];[dr]**\dir{-} & B & C\\
    D & E\POS[];[l]**\dir{.},[];[r]**\dir{~} & F\POS[];[dl]**\dir{~}\\
    G & H & I}
\end{document}
