1 --10--8--7--------------------8--7-----------------
2 ------------10--8--7----------------10--8--7-------
3 -----------------------9--7-------------------9--7-
4 ---------------------------------------------------
5 ---------------------------------------------------
6 ---------------------------------------------------
1 ------7--------------------------------------------
2 ---------10--8--7-----------------10--8--7---------
3 ---------------------9--7-------------------9--7---
4 --10-----------------------10--9-------------------
5 ---------------------------------------------------
6 ---------------------------------------------------
1 ---------------------------------------------------
2 ---------------------------------------------------
3 ---------------------------------------------------
4 --10--9--7------------------------------------------
5 ---------------------------------------------------
6 ---------------------------------------------------