scope ai_mechListNamesForAngleBracketCategory.

static TimedCache<Map<A, Set<S>> #cache = TimedCache(10.0);

static Set<S> ai_mechListNamesForAngleBracketCategory(S s) {
  Map<S, Set<S>> map = cache.get(f newHashMap);
  if (map.containsKey(s)) ret map.get(s);
  // Derive from the category name
  Set<S> set = litCISet(plural_mech(replace(deAngleBracket(s), "_", " ")));
  set.addAll(mechMultiMapCI("Word category => List").get(s));
  map.put(s, set);
  ret set;
}