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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 04-08-2 on page 50.
+%% 
+%%  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}{18}
+\renewcommand\theequation{4.\arabic{equation}}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}a \rightarrow b\end{equation}
+\begin{equation}
+a \hphantom{\rightarrow} b
+\end{equation}
+\end{document}