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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}