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\begin{alltt}
STk> (define g (graph '(1 2 3) '((1 2) (2 3) (3 1)))){\em{
\#[undefined]} }
\end{alltt}
\begin{alltt}
STk> (describe g){\em{
\#[\(<\)ubingraph*\(>\) \#p4f932c] is an instance of class \(<\)ubingraph*\(>\)
Slots are: 
     val = \{[1 2 3]  \{\{1 2\} \{1 3\} \{2 3\}\}\}
\#f} }
\end{alltt}

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