static L<TripleWeb> ai_triplesSortedByDescCreationDate(Collection<TripleWeb> l) {
  L<TripleWeb> l2 = cloneList(l);
  sort(l2, new Comparator<TripleWeb>() {
    public int compare(TripleWeb a, TripleWeb b) {
      ret sign(b.created_compact-a.created_compact);
    }
  });
  ret l2;
}