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%%
%% The LaTeX Companion, 3ed
%%
%% Example 11-5-17 on page II-189 in "underoverlap --- Partly overlapping horizontal braces".
%%
%% 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{tlc3examargin}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}
% Shorten the vertical size of the example ...
\AtBeginDocument{%
\setlength\abovedisplayskip{.1\abovedisplayskip}%
\setlength\belowdisplayskip{.1\belowdisplayskip}%
}
%StartShownPreambleCommands
\usepackage{underoverlap,amsmath}
%StopShownPreambleCommands
\begin{document}
\begin{gather} a + \UOLoverbrace{b +}[c + d]^{\text{both}}
\UOLunderline{+ f}_{\text{fine}} + g \\
a + \UOLoverline{b +}[c + d]^{\text{wrong!!}} + f + g \\
a + \UOLoverbrace{b +}[c + d]^{\text{clearly wrong}}
+ f \UOLunderbrace{+ g}_{\text{too!}} \end{gather}
\end{document}
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