String get_rep2()
  {
	switch( action_type )
        {
	case SS_ACTION_CUT:
		return "CUT(" + arg + ")";
	case SS_ACTION_ZERO:
		return "ZERO(" + arg + ")";
	case SS_ACTION_RANGE_ERROR:
		return "RANGE_ERROR";
	case SS_ACTION_RESTART:
		return "RESTART";
	case SS_ACTION_DONE:
		return "DONE";
	case SS_ACTION_NEGATE:
		return "NEGATE";
	default:
		return "HUH???";
	}
  }