svoid deleteConcepts(Cl conceptsOrIDs) {
  db_mainConcepts().deleteConcepts(asList(conceptsOrIDs));
}

static <A extends Concept> L<A> nuLike deleteConcepts(Concepts cc default db_mainConcepts(), Class<A> c, O... params) {
  L<A> l = asList(findConceptsWhere(cc, c, params));
  deleteConcepts(l);
  ret l;
}

static <A extends Concept> L<A> nuLike deleteConcepts(Concepts cc default db_mainConcepts(), Class<A> c, IPred<A> pred) {
  ret deleteConcepts(filter(list(cc, c), pred));
}