code: def reconcileNodeReg(self) -> set:
          
  
          matches = set()
          for name, remote in self.remotes.items():
              if name not in self.registry:
                  continue
              if self.sameAddr(remote.ha, self.registry[name]):
                  matches.add(name)
                  logger.debug("{} matched remote {} {}".
                               format(self, remote.uid, remote.ha))
          return self.registry.keys() - matches - {self.name}
docs: Check whether registry contains some addresses
          that were never connected to
          :return: