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%%
%% An UIT Edition example
%%
%% Example 04-11-3 on page 60.
%%
%% Copyright (C) 2010 Herbert Voss
%%
%% 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.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\makeatletter
\def\underbracket{%
\@ifnextchar[{\@underbracket}{\@underbracket[\@bracketheight]}}
\def\@underbracket[#1]{%
\@ifnextchar[{\@under@bracket[#1]}{\@under@bracket[#1][0.4em]}}
\def\@under@bracket[#1][#2]#3{%\message {Underbracket: #1,#2,#3}
\mathop{\vtop{\m@th\ialign{##\crcr $\hfil \displaystyle {#3}\hfil $%
\crcr\noalign{\kern 3\p@ \nointerlineskip }\upbracketfill {#1}{#2}
\crcr\noalign{\kern 3\p@ }}}}\limits}
\def\upbracketfill#1#2{$\m@th \setbox \z@ \hbox {$\braceld$}
\edef\@bracketheight{\the\ht\z@}\bracketend{#1}{#2}
\leaders \vrule \@height #1 \@depth \z@ \hfill
\leaders \vrule \@height #1 \@depth \z@ \hfill \bracketend{#1}{#2}$}
\def\bracketend#1#2{\vrule height #2 width #1\relax} %$
\makeatother
\AtBeginDocument{\setlength\parindent{0pt}}
\StartShownPreambleCommands
\StopShownPreambleCommands
\begin{document}
\setlength\arraycolsep{0pt}
$\begin{array}{@{}ccccc@{}}
\textrm{hate \LaTeX\ }
& \underbracket[0.5pt]{1\rightarrow2\rightarrow3\rightarrow4}
& \underbracket[0.75pt][0.75em]{\rightarrow5\rightarrow6\rightarrow7}
& \underbracket[1pt][1em]{\rightarrow8\rightarrow9\rightarrow10}
& \textrm{~love \LaTeX}\\
& \textrm{little} & \textrm{medium} & \textrm{lots}
\end{array}$
\end{document}
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