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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}
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