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\begin{frame}
  \frametitle{Example Database}
  
  \begin{exampleblock}{}
  \parbox[t]{0.55\linewidth}{
    \tablestudents
    
    \medskip
    \tableexercises
  }\quad
  \parbox[t]{0.35\linewidth}{%
    \tableresults
  }
  \end{exampleblock}
\end{frame}