\begin{frame}
  \frametitle{Relationship Sets}

  \movieexample
  \bigskip
  \pause
  
  \begin{block}{}
    A \emph{relationship} is an association among several entities.\\
  \end{block}
  Formally, a relationship is a tuple $(e_1,e_2,\ldots,e_n)$ of entities.
  \medskip
  
  \begin{exampleblock}{}
    \begin{itemize}
      \item $(\text{Mark Hamill},\,\text{Star Wars})$ is a relationship
      \item $(\text{Harrison Ford},\,\text{Indiana Jones})$ is a relationship
    \end{itemize}
  \end{exampleblock}
  \vspace{10cm}
\end{frame}