code: def _init_kwelems(self):
          
          ret = set()
          if 'rcntobj' in self.kws:
              ret.add('dcnt')
              ret.add('D1')
          if 'tcntobj' in self.kws:
              ret.add('tcnt')
              ret.add('tfreq')
              ret.add('tinfo')
          return ret
docs: Init set elements.