\begin{frame} \frametitle{Entity-Relationship Model} \entityexample \vspace{1cm} The three main ingredients of entity-relationship diagrams are: \begin{itemize} \medskip \item \emph{Entity sets} \medskip \item \emph{Attributes} \medskip \item \emph{Relationship sets} \end{itemize} \vspace{10cm} \end{frame}