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\begin{diagram}{Expressions}{expressions}
\begin{mysyntdiag}
\synt{expression}
\synt{simple\ expression}
\begin{stack}\\
\begin{stack}
\verb+ * + \\
\verb+ <= + \\
\verb+ > + \\
\verb+ >= + \\
\verb+ = + \\
\verb+ <> + \\
\verb+ in + \\
\verb+ is +
\end{stack}
\synt{simple\ expression}
\end{stack}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{simple\ expression}
\begin{rep}[b] \synt{term} \\
\begin{stack}
\lit* + \\
\lit* - \\
\lit*{or} \\
\lit*{xor}
\end{stack}
\end{rep}
\end{mysyntdiag}
\end{diagram}
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