static <A, B> LinkedHashMap<A, B> orderMapByComparator(Comparator<A> c, Map<A, B> map) {
  L<A> l = new ArrayList(keys(map));
  sort(l, c);
  new LinkedHashMap<A, B> map2;
  for (A a : l)
    map2.put(a, map.get(a));
  ret map2;
}