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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 10-03-2 on page 202.
+%% 
+%%  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}}
+\setcounter{equation}{1}
+\renewcommand\theequation{10.\arabic{equation}}
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation}
+\begin{array}{rcl}
+\underline{RS} & = & \left(\begin{array}{*8c}
+01 & a4 & 55 & 87 & 5a & 58 & db & 9e\\ a4 & 56 & 82 & f3 & 1e & c6 & 68 & e5\\
+02 & a1 & fc & c1 & 47 & ae & 3d & 19\\ a4 & 55 & 87 & 5a & 58 & db & 9e & 03
+\end{array}\right)\\~\\
+\left(\begin{array}{c}  s_{i,0}\\  s_{i,1}\\  s_{i,2}\\  s_{i,3}
+\end{array}\right) & = & \underline{RS} \times
+\left(\begin{array}{c}  m_{8i+0}\\ m_{8i+1}\\ \cdots\\ m_{8i+6}\\ m_{8i+7}
+\end{array}\right)\\~\\
+  S_{i} & = & \sum_{j=0}^{3}s_{i,j}\times2^{8j}\qquad i=0,1,...,k-1\\
+  S & = & \left(S_{k-1},S_{k-2},...,S_{1},S_{0}\right)
+\end{array}
+\end{equation}
+\end{document}