\begin{frame}
  \frametitle{WW Conflicts}
  
  \begin{goal}{}
    There is a \emph{WW conflict} between $T_1$ and $T_2$ if there is an item Y:%
    \begin{itemize}
      \item $T_1$ writes Y and afterwards, $T_2$ writes Y
    \end{itemize}
  \end{goal}
  This write becomes \emph{overwritten}.
  \bigskip
  \pause
  
  \begin{quiz}{\textwidth}{Find all WW conflicts in the following schedule}
    \begin{tcenter}
      \begin{tikzpicture}
        \schedule{}{3}{1wY!1+1|2wV!2+1|3wV!2+1|2rZ|2wY!1+1|2wZ}
      \end{tikzpicture}
    \end{tcenter}
  \end{quiz}
\end{frame}