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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 06-11-3 on page 105.
+%% 
+%%  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{amsmath}
+\StopShownPreambleCommands
+\begin{document}
+\begin{align}
+  H_c &= \frac{1}{2n} \sum^n_{l=0} (-1)^l (n-l)^{p-2} \sum_{l_1 + \dots + l_p=l}
+         \prod^p_{i=1} \binom{n_i}{l_i} \tag{*}\label{eq:tagDemo}\\
+      &  \quad\times [(n-l)-(n_i-l_i)]^{n_i-l_i}\tag{II-AZ}\label{eq:tagDemo2}
+\end{align}
+You can also reference tags, as the label~\eqref{eq:tagDemo}
+or~\ref{eq:tagDemo2}.
+\end{document}