1|-5---5---5---5--------5---5---6---6---5---5---5---5
2|--6-6-6-6-5-5-5-5--x2--6-6-6-6-6-6-6-6-6-6-6-6-5-5-5-5
3|---7---7---6---6--------7---7---7---7---5---5---6---6