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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example A-3-7 on page 874.
+%%
+%% 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{ifthen}
+\newcommand\IXE[2][!*!,!]{%
+ \ifthenelse{\equal{#1}{!*!,!}}%
+ {\ifthenelse{\equal{#2}{}}{}{\textbf{#2}\index{#2}}}%
+ {\ifthenelse{\equal{#1}{}}{}{\index{#1}}%
+ \ifthenelse{\equal{#2}{}}{}{\textbf{#2}}}}
+\StopShownPreambleCommands
+\begin{document}
+\par Identical in text and index |\IXE{both}|.
+\par Different in text and index |\IXE[index]{text}|.
+\par Only to index |\IXE[indexonly]{}|.
+\par In text only |\IXE[]{textonly}|.
+\par Nothing in text or index |\IXE[]{}|.
+\end{document}