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+%%
+%% The LaTeX Companion, 3ed
+%%
+%% Example 2-2-2 on page I-36 in "Numbering headings".
+%%
+%% 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{171.0pt}
+%StartShownPreambleCommands
+\renewcommand\thesubsection
+ {\fbox{\thesection.\arabic{subsection}}}
+%StopShownPreambleCommands
+
+\begin{document}
+\setcounter{section}{3}
+\subsection{A mistake}\label{wrong}
+Referencing a subsection in this format produces
+a funny result as we can see looking at
+subsection~\ref{wrong}. We get a boxed reference.
+\end{document}