scope ai_mechPatternListNamesForAngleBracketCategory.

static TimedCache<Map<S, Set<S>>> #cache = TimedCache(5.0);

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

end scope

Began life as a copy of #1017299