svoid gazelle_sortBeforeCommit(L<GazelleTree> l) {
  sort(l, new Comparator<GazelleTree> {
    public int compare(GazelleTree a, GazelleTree b) {
      int c = ai_goodBadToInt(a.prediction) - ai_goodBadToInt(b.prediction);
      if (c != 0) ret c;
      c = gazelle_historyLevelRequired(a.rule()) - gazelle_historyLevelRequired(b.rule());
      ret c;
    }
  });
}