static <A extends Concept> L<A> findConcepts(Class<A> c, O... params) {
  ret findConceptsWhere(c, params);
}

static L<Concept> findConcepts(S c, O... params) {
  ret findConceptsWhere(c, params);
}

static <A extends Concept> L<A> findConcepts(Concepts concepts, Class<A> c, O... params) {
  ret findConceptsWhere(concepts, c, params);
}

static L<Concept> findConcepts(Concepts concepts, S c, O... params) {
  ret findConceptsWhere(concepts, c, params);
}