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%  Chapter 2
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\chapter{Chapter Title2}
\label{ch2}
% the label lets you refer to the chapter by number later.

Talk a little. \cite{keyword1}

\section{Section Title}
\label{s2.1}

Talk a lot.

\begin{thm}[Theorem 1 \cite{keyword2}]
\label{thm1}
Stuff is important.
\end{thm}

\section{Another Section Title}
\label{s2.2}

Do it again.

Theorem~\ref{thm1} is really important.  Chapter~\ref{ch1} was awesome.