code: def ret_nodegroup_minions(self):
          '''
          Return minions which match the special list-only groups defined by
          ssh_list_nodegroups
          '''
          nodegroup = __opts__.get('ssh_list_nodegroups', {}).get(self.tgt, [])
          nodegroup = _tgt_set(nodegroup)
          return self._ret_minions(nodegroup.intersectionf ret_nodegroup_minions(self):
          '''
          Return minions which match the special list-only groups defined by
          ssh_list_nodegroups
          '''
          nodegroup = __opts__.get('ssh_list_nodegroups', {}).get(self.tgt, [])
          nodegroup = _tgt_set(nodegroup)
          return self._ret_minions(nodegroup.intersection)
docs: Return minions which match the special list-only groups defined by
          ssh_list_nodegroups