<HTML>
<!--
  -- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
  --
  -- Permission to use, copy, modify, distribute and sell this software
  -- and its documentation for any purpose is hereby granted without fee,
  -- provided that the above copyright notice appears in all copies and
  -- that both that copyright notice and this permission notice appear
  -- in supporting documentation.  We make no
  -- representations about the suitability of this software for any
  -- purpose.  It is