code: def dir_tails(self, rr_id: str) -> str:
          
  
          return Tails.dir(self._dir_tails, rr_id)
docs: Return path to the correct directory for the tails file on input revocation registry identifier.
  
          :param rr_id: revocation registry identifier of interest
          :return: path to tails dir for input revocation registry identifier