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\begin{alltt}
STk> (define g (graph)){\em{
\#[undefined]} }
\end{alltt}
\begin{alltt}
STk> (describe g){\em{
\#[\(<\)ubingraph*\(>\) \#p4ee4f0] is an instance of class \(<\)ubingraph*\(>\)
Slots are: 
     val = \{[]  \{\}\}
\#f} }
\end{alltt}

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