static Cache<Map<S, AIConcept>> aiConceptsMap_cached_cache = new Cache(f aiConceptsMap);

static Map<S, AIConcept> aiConceptsMap_cached() {
  ret aiConceptsMap_cached_cache!;
}

static void aiConceptsMap_clearCache() {
  aiConceptsMap_cached_cache.clear();
}

// clear cache if older than x seconds
static void aiConceptsMap_clearCache(double seconds) {
  aiConceptsMap_cached_cache.clear(seconds);
}