      \fitem{take}(t:tab, x:tab) gives the tab of
      elements whose indices are in tab \code{x}. Equivalent to 
      \begin{lstlisting}
            [t[x[$i]] | $i in @size(x)]
      \end{lstlisting}
      See also functions \acode{cdr}, \acode{drop} and \acode{slice}.



      %%% -------------------------------------------------------

