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   177 \end{frame} | 
   177 \end{frame} | 
   178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     | 
   178 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     | 
   179   | 
   179   | 
   180 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   180 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   181 \begin{frame}[c] | 
   181 \begin{frame}[c] | 
   182 \frametitle{CF Grammars} | 
   182 \frametitle{CFGs} | 
   183   | 
   183   | 
   184 A \alert{\bf context-free grammar} \bl{$G$} consists of | 
   184 A \alert{\bf context-free grammar} \bl{$G$} consists of | 
   185   | 
   185   | 
   186 \begin{itemize} | 
   186 \begin{itemize} | 
   187 \item a finite set of nonterminal symbols (e.g.~$\meta{A}$ upper case) | 
   187 \item a finite set of nonterminal symbols (e.g.~$\meta{A}$ upper case) |