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\begin{frame}
  \frametitle{Exam Task from 2005}

  \vspace{-1.5ex}
  \begin{center}
  \includegraphics[width=.78\textwidth,trim=0mm 10mm 0mm 30mm,clip]{../derivatives/picture_exam2003.pdf}\\
  \quad\quad\quad\quad\includegraphics[width=.78\textwidth]{../derivatives/picture_exam2003b.pdf} \pause\quad \raisebox{2cm}{C}
  \end{center}
\end{frame}