      \fitem{find}{(t:tab \emph{or} m:map \emph{or} s:string, f:function)}
      returns the index of the first element of \code{t}, \code{m} or
      \code{s} that satisfies the predicate \code{f}. The predicate
      \code{f} is a binary function taking the index or the key as the
      first argument and the associated value for the second argument.
      %% 
      See also \acode{count}, \acode{member} and \acode{occurs}. The undef
      value (for maps) or the integer \code{-1} (for tab and string) is
      returned if there is no pair satisfying the predicate. 



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

