static <A extends Concept> L<A> nuLike list(Class<A> type, Concepts cc default db_mainConcepts()) {
  ret cc.list(type);
}

static <A extends Concept> L<A> list(Concepts concepts, Class<A> type) {
  ret concepts.list(type);
}

static L<Concept> list(S type) {
  ret db_mainConcepts().list(type);
}

static L<Concept> list(Concepts concepts, S type) {
  ret concepts.list(type);
}

static L<Concept> list(Concepts concepts) {
  ret asList(concepts.allConcepts());
}