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+%%
+%% An UIT Edition example
+%%
+%% Example 10-04-9 on page 207.
+%%
+%% 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}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\usepackage{mathtools}
+\newcommand*\num[1]{\hphantom{#1}} \newcommand*\vsp{\vphantom{\rangle_1}}
+\StopShownPreambleCommands
+\begin{document}
+\begin{equation*}
+ \frac{300}{5069} \underbrace{\longmapsto\vphantom{\frac{1}{1}}}_{%
+ \mathclap{\substack{\Delta a=271\num9\vsp \\[2pt]
+ \Delta b=4579\vsp\\[2pt]
+ \text{$1$ iteration}}}}\frac{29}{490}
+ \underbrace{\longmapsto \frac{19}{321}\longmapsto}_{%
+ \mathclap{\substack{\Delta a=10\num{9}=\langle271\rangle_{29}\num{20}\\[2pt]
+ \Delta b=169=\langle4579\rangle_{490}\\[2pt]
+ \text{$2$ iterations}}}}\frac{9}{152}
+ \underbrace{\longmapsto \frac{8}{135}\longmapsto\dots\longmapsto}_{%
+ \substack{\Delta a=1\num{7}=\langle10\rangle_{9}\num{119}\\[2pt]
+ \Delta b=17=\langle169\rangle_{152}\\[2pt]
+ \text{$8$ iterations}}}\frac{1}{16}
+ \underbrace{\longmapsto\dots\longmapsto\vphantom{\frac{8}{135}}}_{%
+ \substack{\Delta a=0=\langle1\rangle_{1}\num{76} \\[2pt]
+ \Delta b=1=\langle17\rangle_{16} \\[2pt]
+ \text{$8$ iterations}}}\frac{1}{1}
+\end{equation*}
+\end{document}