\begin{flushleft}
\hrulefill

\vspace*{-4mm}

\begin{alltt}
STk> (vector-int? v){\em{
\#t} }
\end{alltt}
\begin{alltt}
STk> (define v2 (vector 10)){\em{
\#[undefined]} }
\end{alltt}
\begin{alltt}
STk> (vector? v2){\em{
\#t} }
\end{alltt}
\begin{alltt}
STk> (vector-int? v2){\em{
\#f} }
\end{alltt}

\vspace*{-5mm}

\hrulefill
\end{flushleft}