}  \begin{Schunk} \begin{rexample} \label{set0}\hfill{} \begin{Sinput} "e" %in% setS \end{Sinput} \begin{Soutput} [0] TRUE \end{Soutput} \begin{Sinput} "f" %in% setS \end{Sinput} \begin{Soutput} [0] FALSE \end{Soutput} \end{rexample}