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+%%
+%% The LaTeX Companion, 2ed (second printing August 2004)
+%%
+%% Example 2-4-6 on page 73.
+%%
+%% 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{81.00082pt}
+\setlength\textheight{11\baselineskip}
+\sloppy
+\pagestyle{origplain}
+
+\StartShownPreambleCommands
+\usepackage{varioref,ifthen}
+\newcommand\veqns[2]{%
+  \vrefpagenum\firstnum{#1}%
+  \vrefpagenum\secondnum{#2}%
+  the equation%
+  \ifthenelse
+    {\equal\firstnum\secondnum}%
+    {s \ref{#1}}%
+    { \ref{#1}\vpageref{#1}}%
+  \space and \ref{#2}\vpageref{#2}%
+}
+\StopShownPreambleCommands
+\begin{document}
+Test: \veqns{A}{B} \par Test: \veqns{A}{C}
+\begin{equation} a=b+c \label{A}\end{equation}
+\begin{equation} b=a+c \label{B}\end{equation}
+\newpage
+Test: \veqns{A}{B} \par Test: \veqns{A}{C}
+\newpage
+\begin{equation} c=a+b \label{C}\end{equation}
+\end{document}