       (int * 'a * 'b -> bool) -> 'a list * 'b list -> (int * 'a * 'b) list
	val filteriEq :     (int * 'a * 'b -> bool) -> 'a list * 'b list -> (int * 'a * 'b) list
    end
  </PRE>

<?php section("description", "description") ?>

  <P>
    Items not described here are as in the  Standard ML Basis'
    <A href="http://www.standardml.org/Basis/list-pair.html"><TT>ListPair</TT></A> structure.
  </P>

  <DL>
    <DT>
      <TT>appr <I>f</I> (<I>l1</I>, <I>l2</I>)</TT>
    </DT>
    <DD>
      <P>Like <TT>app<