code: def paxos_instance(self):
          
          # Construct instance with the constant attributes.
          instance = PaxosInstance(self.network_uid, self.quorum_size)
  
          # Set the variable attributes from the aggregate.
          for name in self.paxos_variables:
              value = getattr(self, name, None)
              if value is not None:
                  if isinstance(value, (set, list, dict, tuple)):
                      value = deepcopy(value)
                  setattr(instance, name, value)
  
          # Return the instance.
          return instance
docs: Returns instance of PaxosInstance (protocol implementation).