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\begin{frame}
  \frametitle{Cardinality Limits}
  
  Express the following:
  \begin{itemize}
    \item Every $a$ in $A$ is connected to precisely one $b$ in $B$,\\
          and every $b$ in $B$ is connected to at most one $a$ in $A$.
    \begin{center}
  \pause
    \begin{tikzpicture}[every edge/.style={link},node distance=18mm,>=triangle 45]
      \begin{scope}
        \node[relationship] (R) {R};
        \node (l) [left of=R,entity,minimum size=4mm] {A}; \draw (R) -- node[above,pos=.6] {$0\sldots1$} (l); 
        \node (r) [right of=R,entity,minimum size=4mm] {B}; \draw (R) -- node[above,pos=.7] {$1\sldots 1$} (r);
      \end{scope}
    \end{tikzpicture}
    \end{center}

  \pause
    \item Every $a$ in $A$ is connected to one or more $b$ in $B$,\\
          and every $b$ in $B$ is connected to at most one $a$ in $A$.
  \pause
    \begin{center}
    \begin{tikzpicture}[every edge/.style={link},node distance=18mm,>=triangle 45]
      \begin{scope}
        \node[relationship] (R) {R};
        \node (l) [left of=R,entity,minimum size=4mm] {A}; \draw (R) -- node[above,pos=.6] {$0\sldots 1$} (l); 
        \node (r) [right of=R,entity,minimum size=4mm] {B}; \draw (R) -- node[above,pos=.6] {$1\sldots *$} (r);
      \end{scope}
    \end{tikzpicture}
    \end{center}

  \pause
    \item Every $a$ in $A$ is connected to one or more $b$ in $B$,\\
          and every $b$ in $B$ is connected to precisely one $a$ in $A$.
  \pause
    \begin{center}
    \begin{tikzpicture}[every edge/.style={link},node distance=18mm,>=triangle 45]
      \begin{scope}
        \node[relationship] (R) {R};
        \node (l) [left of=R,entity,minimum size=4mm] {A}; \draw (R) -- node[above,pos=.7] {$1\sldots 1$} (l); 
        \node (r) [right of=R,entity,minimum size=4mm] {B}; \draw (R) -- node[above,pos=.6] {$1\sldots *$} (r);
      \end{scope}
    \end{tikzpicture}
    \end{center}
  \end{itemize}
\end{frame}