e of
      unequal lengths, the excess elements from the tail of the longer one are
      ignored. The above expression is equivalent to:</P>
      <PRE>
         List.find <I>f</I> (zip (<I>l1</I>, <I>l2</I>))</PRE>
    </DD>

    <DT>
      <TT>appi <I>f</I> (<I>l1</I>, <I>l2</I>)</TT> <BR>
      <TT>appri <I>f</I> (<I>l1</I>, <I>l2</I>)</TT> <BR>
      <TT>mapi <I>f</I> (<I>l1</I>, <I>l2</I>)</TT> <BR>
      <TT>mapiPartial <I>f</I> (<I>l1</I>, <I>l2</I>)</TT> <BR>
      <TT>foldli <I>f</I> <I>b</I> (<I>