- item_l_drul_[RIGHT]->column_l ()->add_rod
- (item_l_drul_[LEFT]->column_l (), distance_f_);
- item_l_drul_[LEFT]->column_l ()->add_rod
- (item_l_drul_[RIGHT]->column_l (), distance_f_);
+ columnize();
+ if (item_l_drul_[LEFT] != item_l_drul_[RIGHT])
+ Spaceable_element::add_rod (item_l_drul_[LEFT],
+ item_l_drul_[RIGHT],
+ distance_f_ );