code: def merge_list_members(self, list_, record_data, merge_rule):
          
          list_ = list_.get_soap_object(self.client)
          record_data = record_data.get_soap_object(self.client)
          merge_rule = merge_rule.get_soap_object(self.client)
          return MergeResult(self.call('mergeListMembers', list_, record_data, merge_rule))
docs: Responsys.mergeListMembers call
  
          Accepts:
              InteractObject list_
              RecordData record_data
              ListMergeRule merge_rule
  
          Returns a MergeResult