\begin{Schunk}
\begin{Sinput}
 a
\end{Sinput}
\begin{Soutput}
[1] 0.58
\end{Soutput}
\begin{Sinput}
 b
\end{Sinput}
\begin{Soutput}
[1] 0.08
\end{Soutput}
\begin{Sinput}
 a-b
\end{Sinput}
\begin{Soutput}
[1] 0.5
\end{Soutput}
\end{Schunk}
