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static TimedCache<Comparator<S>> ai_smallerCategoryComparator_cache = new TimedCache(10.0);

static Comparator<S> ai_smallerCategoryComparator() {
  ret ai_smallerCategoryComparator_cache.get(f ai_smallerCategoryComparator_uncached);
}

static Comparator<S> ai_smallerCategoryComparator_uncached() {
  final Set<Pair<S>> set = new HashSet(pairsToLower(ai_texts_unquoteBoth("is a smaller category than")));
  ret new Comparator<S>() {
    public int compare(S a, S b) {
      a = lower(a);
      b = lower(b);
      if (set.contains(pair(a, b))) ret -1;
      if (set.contains(pair(b, a))) ret 1;
      ret 0;
    }
  };
}