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%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-2-26 on page 533.
%% 
%%  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{207.83385pt}
\AtBeginDocument{\setlength\unitlength{0.09pt}}
%% Small unitlength may result in diagonal connections to vanish unless
%% a package like epic, eepic, or pict2e is being used that supports small lines
%%
\usepackage{pict2e}

\StartShownPreambleCommands
\usepackage{aliphat}
\StopShownPreambleCommands
\begin{document}
\ethylene{1==C;2==C}
    {1==F;2==Cl;3==H;4==Br}
\qquad
\ethylenev[t{2+}]{1==C;2==N}
    {1==H$_3$C;2==CH$_3$;3==H}
\end{document}