%% 
%%  An UIT Edition example
%% 
%%  Example 06-10-1 on page 103.
%% 
%%  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}}
\StartShownPreambleCommands
\usepackage{amsmath}
\StopShownPreambleCommands
\begin{document}
\begin{tabular}{@{} *{2}{r@{\,\,$\rightarrow$\,\,} l} @{}}\hline
\emph{input} & \emph{output} & \emph{input} &\emph{output}\\\hline
\rule{0pt}{2.6ex}%
\verb+a\mod{n^2}=b+   & $a\mod{n^2}=b$ & \verb+a\bmod{n^2}=b+ & $a\bmod{n^2}=b$\\[2pt]
\verb+a\pmod{n^2}=b+  & $a\pmod{n^2}=b$ &\verb+a\pod{n^2}=b+   & $a\pod{n^2}=b$\\\hline
\end{tabular}
\end{document}