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   437 \end{center} | 
   437 \end{center} | 
   438   | 
   438   | 
   439 \end{frame} | 
   439 \end{frame} | 
   440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     | 
   440 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     | 
   441   | 
   441   | 
   442   | 
   442 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   443 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   443 \begin{frame}[c] | 
   444 \begin{frame}[t] | 
   444 \frametitle{Another Homework\\[-2mm] Question} | 
   445 \frametitle{A Matching Algorithm (1)} | 
   445   | 
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   446 \begin{itemize} | 
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   447 \item How many basic regular expressions are there to match  | 
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   448   the string \bl{$abcd$}\,?\pause | 
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   449 \item How many if they cannot include  | 
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   450   \bl{$\ONE$} and \bl{$\ZERO$}\/?\pause | 
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   451 \item How many if they are also not  | 
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   452   allowed to contain stars?\pause  | 
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   453 \item How many if they are also  | 
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   454       not allowed to contain \bl{$\_ + \_$}\/?  | 
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   455 \end{itemize}   | 
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   456   | 
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   457 \end{frame} | 
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   458 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     | 
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   459   | 
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   460 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
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   461 \begin{frame}[t] | 
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   462 \frametitle{Brzozowski's Algorithm (1)} | 
   446   | 
   463   | 
   447   | 
   464   | 
   448 \ldots{}whether a regular expression can match the empty string: | 
   465 \ldots{}whether a regular expression can match the empty string: | 
   449 \begin{center} | 
   466 \begin{center} | 
   450 \begin{tabular}{@ {}l@ {\hspace{2mm}}c@ {\hspace{2mm}}l@ {}} | 
   467 \begin{tabular}{@ {}l@ {\hspace{2mm}}c@ {\hspace{2mm}}l@ {}} |