\begin{frame}
  \frametitle{Express the following Cardinality Limits}
  
  \begin{quiz}{\textwidth}{}
    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 $A$.
  \end{quiz}
  \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] {$0\sldots1$} (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
  \begin{quiz}{\textwidth}{}
    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 $A$.
  \end{quiz}
  \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
  \begin{quiz}{\textwidth}{}
    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 $A$.
  \end{quiz}
  \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{frame}