\begin{frame}{Exercise (4)}
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  \begin{exampleblock}{}
    Show that the following language is regular:
    \begin{talign}
      \{\,a^{2n+1} \mid n\geq 0 \,\} \cup \{\,  b^{2n} \mid n \ge 0\,\}
    \end{talign}
    \emph{Construct a deterministic finite automaton} for the language.
  \end{exampleblock}
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