code: def sync_list_permissions(self):
          
          if self._sync_list_permissions is None:
              self._sync_list_permissions = SyncListPermissionList(
                  self._version,
                  service_sid=self._solution['service_sid'],
                  list_sid=self._solution['sid'],
              )
          return self._sync_list_permissions
docs: Access the sync_list_permissions
  
          :returns: twilio.rest.sync.v1.service.sync_list.sync_list_permission.SyncListPermissionList
          :rtype: twilio.rest.sync.v1.service.sync_list.sync_list_permission.SyncListPermissionList