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%%
%% The LaTeX Companion, 3ed
%%
%% Example 2-4-7 on page I-87 in "cleveref --- Cleverly formatted references".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{195.0pt}
\usepackage{amsmath,cleveref}
\AtEndDocument{% we place the equations at the document end so that
% they do not show up in the book and take up unnecessary space
\newpage
\begin{align}
a &= b \label{eq:a} \\
b &< c \label{eq:b} \\
c &< d \label{eq:c} \\
d &< e \label{eq:d} \\
a &< e \label{eq:e} \\
\end{align}
}
%StartShownPreambleCommands
% equations as before + 2 more
%StopShownPreambleCommands
\begin{document}
\Cref{eq:c,eq:b,eq:a,eq:d,eq:e} are sorted and
\cref{eq:c,eq:b,eq:a,eq:e} are sorted with a gap.
But compare these results with referencing
\cref{eq:c,,eq:b,eq:a,eq:d,eq:e}! Surprised?
\end{document}
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