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   887 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   887 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   888 \begin{frame}[c] | 
   888 \begin{frame}[c] | 
   889 \frametitle{Simplification} | 
   889 \frametitle{Simplification} | 
   890   | 
   890   | 
   891 \begin{itemize} | 
   891 \begin{itemize} | 
   892 \item If we simplify after the derivative, then we are builing the  | 
   892 \item If we simplify after the derivative, then we are building the  | 
   893 value for the simplified regular expression, but \emph{not} for the original | 
   893 value for the simplified regular expression, but \emph{not} for the original | 
   894 regular expression.  | 
   894 regular expression.  | 
   895 \end{itemize} | 
   895 \end{itemize} | 
   896   | 
   896   | 
   897 \begin{center} | 
   897 \begin{center} |