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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 04-18-9 on page 67.
+%% 
+%%  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{105.70511pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+
+\StopShownPreambleCommands
+\begin{document}
+\[
+\sum_{\makebox[0pt]{${\scriptscriptstyle 1\le i\le p\atop {%
+      {1\le j\le q\atop 1\le k\le r}}}%
+    $}}a_{ij}b{\mbox{\boldmath$_{jk}$\unboldmath}}c_{ki}
+\]
+\end{document}