code: static boolean isValidSetOpID(final int id) {
      final Family family = Family.idToFamily(id);
      final boolean ret = ((family == Family.UNION) || (family == Family.INTERSECTION)
          || (family == Family.A_NOT_B));
      return ret;
    }
docs: Returns true if given Family id is one of the set operations
  @param id the given Family id
  @return true if given Family id is one of the set operations