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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 8-2-29 on page 485.
+%%
+%% 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{ttctexa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{135.0pt}
+
+\StartShownPreambleCommands
+\usepackage{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{subequations} \label{eq:1}
+\begin{align} f &= g \label{eq:1A} \\
+ f' &= g' \label{eq:1B} \\
+ \mathcal{L}f &= \mathcal{L}g \label{eq:1C}
+\end{align}
+\end{subequations}
+\begin{subequations} \label{eq:2}
+\renewcommand\theequation{\theparentequation\roman{equation}}
+\begin{align} f &= g \label{eq:2A} \\
+ f' &= g' \label{eq:2B} \\
+ \mathcal{L}f &= \mathcal{L}g + K \label{eq:2C}
+\end{align}
+\end{subequations}
+Note the relationship between~\eqref{eq:1}
+and~\eqref{eq:2}: only~\ref{eq:1C} and~\ref{eq:2C} differ.
+\end{document}