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\begin{frame}{Exercise (3)}
  \bigskip\bigskip
  (Individually, 2 minutes)

  \begin{exampleblock}{}
  Show that the following language is regular.
  \medskip
  
  \emph{Construct a deterministic finite automaton} for the language:
  \begin{talign}
    \{\,a^{2n+1} \mid n\geq 0 \,\} \cup \{\,  b^{2n} \mid n \ge 0\,\}
  \end{talign}
  \end{exampleblock}
  \bigskip 
  \begin{center}
  \includegraphics[height=35mm]{images/thinking.jpg}
  \end{center}
  \vspace{10cm}
\end{frame}