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+
+\newpage
+\section*{The Proof Engine}
+
+\ocwsection \label{proofs}
+This chapter describes the \Coq\ proof engine, which is also called
+the ``refiner'', since it provides a way to build terms by successive
+refining steps. Those steps are either primitive rules or higher-level
+tactics.
+The modules of the proof engine are organized as follows.
+
+\bigskip
+\begin{center}\epsfig{file=proofs.dep.ps,width=\linewidth}\end{center}
+