code: def path_tails(self, rr_id: str) -> str:
          
  
          LOGGER.debug('Issuer.path_tails >>>')
  
          if not ok_rev_reg_id(rr_id):
              LOGGER.debug('Issuer.path_tails <!< Bad rev reg id %s', rr_id)
              raise BadIdentifier('Bad rev reg id {}'.format(rr_id))
  
          rv = Tails.linked(self.dir_tails, rr_id)
          LOGGER.debug('Issuer.path_tails <<< %s', rv)
          return rv
docs: Return path to tails file for input revocation registry identifier.
  
          :param rr_id: revocation registry identifier of interest
          :return: path to tails file for input revocation registry identifier