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   118 \item \bl{$([a$\,-\,$z]^+)^*$} | 
   118 \item \bl{$([a$\,-\,$z]^+)^*$} | 
   119 \item \bl{$(a + a \cdot a)^*$} | 
   119 \item \bl{$(a + a \cdot a)^*$} | 
   120 \item \bl{$(a + a^?)^*$} | 
   120 \item \bl{$(a + a^?)^*$} | 
   121 \end{itemize} | 
   121 \end{itemize} | 
   122   | 
   122   | 
   123 \item sometimes also called \alert{catastrophic backtracking} | 
   123 \item sometimes also called \alert{catastrophic backtracking}\bigskip | 
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   124 \item \small\ldots I hope you have watched the video by the  | 
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   125   StackExchange engineer    | 
   124 \end{itemize} | 
   126 \end{itemize} | 
   125   | 
   127   | 
   126 \end{frame} | 
   128 \end{frame} | 
   127 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   129 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  | 
   128   | 
   130   |