static <A extends Concept> void importAllConceptsOfType(Class<A> cClass, Cl<A> l, O... _) {
  bool debug = boolPar debug(_);
  
  Concepts cc = db_mainConcepts();
  Set<Long> ids = mapToSet(l, c -> c.id);
  fOr (A c : l) {
    A existing = cast cc.getConcept(c.id);
    if (existing == null) {
      if (debug) print("import: adding " + c);
      cc.registerKeepingID(existing = c);
    } else {
      if (debug) print("import: updating " + c);
      copyConceptFields(c, existing);
    }
  }
  for (A c : cloneList(list(cc, cClass)))
    if (!ids.contains(c.id)) {
      if (debug) print("import: deleting " + c);
      deleteConcept(c);
    }
}