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\begin{alltt}
STk> (define ms (mset-int 1 2 2 3)){\em{
\#[undefined]} }
\end{alltt}
\begin{alltt}
STk> (if (member 2 ms)
          (remove! 2 ms)){\em{
\#[undefined]} }
\end{alltt}
\begin{alltt}
STk> (describe ms){\em{
\#[\(<\)mset\(<\)int*\(>\)\(>\) \#p4ec6c0] is an instance of class \(<\)mset\(<\)int*\(>\)\(>\)
Slots are: 
     val = \{1 2 3\}
\#f} }
\end{alltt}

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