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

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

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

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