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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 06-15-3 on page 118.
+%% 
+%%  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{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}
+\fboxsep=0pt}
+\StartShownPreambleCommands
+\usepackage{amsmath,tabularx}
+\makeatletter
+\def\cs#1{\texttt{\$\textbackslash#1\$}}
+\def\mapstofill@{\arrowfill@{\mapstochar\relbar}\relbar\rightarrow}
+\newcommand*\xmapsto[6][]{\ext@arrow #3#4#5#6\mapstofill@{#1}{#2}}
+\makeatother
+\StopShownPreambleCommands
+\begin{document}
+\begin{tabularx}{\linewidth}{@{}XX@{}}
+\cs{ext@arrow 0000}\quad{\large  $\xmapsto[\fbox{-below-}]{\fbox{above}}0000$}
+&\cs{ext@arrow 9000}\quad{\large $\xmapsto[\fbox{-below-}]{\fbox{above}}9000$}\\
+%
+\cs{ext@arrow 0900}\quad{\large  $\xmapsto[\fbox{-below-}]{\fbox{above}}0900$}
+&\cs{ext@arrow 0090}\quad{\large $\xmapsto[\fbox{-below-}]{\fbox{above}}0090$}\\
+%
+\cs{ext@arrow 0009}\quad{\large  $\xmapsto[\fbox{-below-}]{\fbox{above}}0009$}
+&\cs{ext@arrow 0099}\quad{\large $\xmapsto[\fbox{-below-}]{\fbox{above}}0099$}\\
+%
+\cs{ext@arrow 9999}\quad{\large  $\xmapsto[\fbox{-below-}]{\fbox{above}}9999$}
+\end{tabularx}
+\end{document}