static <A extends Concept> int countConcepts(Class<A> c, O... params) {
  ret db_mainConcepts().countConcepts(c, params);
}

static int countConcepts() {
  ret db_mainConcepts().countConcepts();
}

static int countConcepts(S className) {
  ret db_mainConcepts().countConcepts(className);
}

static <A extends Concept> int countConcepts(Concepts concepts, S className) {
  ret concepts.countConcepts(className);
}