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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-2-13 on page 476.
+%%
+%% Copyright (C) 2004 Frank Mittelbach, Michel Goossens,
+%% Johannes Braams, David Carlisle, and Chris Rowley
+%%
+%% 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{ttctexamargin}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{231.0pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+This example has two column-pairs.
+\begin{align} \text{Compare }
+ x^2 + y^2 &= 1 &
+ x^3 + y^3 &= 1 \\
+ x &= \sqrt {1-y^2} &
+ x &= \sqrt[3]{1-y^3}
+\end{align}
+This example has three column-pairs.
+\begin{align}
+ x &= y & X &= Y &
+ a &= b+c \\
+ x' &= y' & X' &= Y' &
+ a' &= b \\
+ x + x' &= y + y' &
+ X + X' &= Y + Y' & a'b &= c'b
+\end{align}
+\end{document}