php section("import", "import") ?>

  <P>
    Imported implicitly.
  </P>

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

  <PRE>
    signature LIST_PAIR =
    sig
        exception UnequalLengths

	val zip :           'a list * 'b list -> ('a * 'b) list
	val zipEq :         'a list * 'b list -> ('a * 'b) list
	val unzip :         ('a * 'b) list -> 'a list * 'b list

	val app :           ('a * 'b -> unit) -> 'a list * 'b list -> unit
	val appEq :         ('a * 'b -> unit) -> 'a list * 'b list -> unit
	val appr