--------------------------------|---------------------------------|
--------------------------------|---------------------------------|
--------------------------------|---------------------------------|
--------------------------------|------------------------8-8-8-8--|
-7-7-6-6-5-5-5-7--7-6-6-5-5-5-5-|-7-7-6-6-5-5-5-7--7-7-7-6-6-6-6--|
-5-5-4-4-3-3-3-5--5-4-4-3-3-3-3-|-5-5-4-4-3-3-3-5--5-5-5----------| x2

-----------------------|-------------------------------|
-----------------------|-------------------------------|
-----------------------|-------------------------------|
-7-7-7-7-7---5-5-5-5-5-|-------------------------------|
-5-5-5-5-5---3-3-3-3-3-|-7-7-7-7-7----6-6-6-6-6-6-6-6--|
-----------------------|-5-5-5-5-5----4-4-4-4-4-4-4-4--|

-----------------------------|-----------------------|
-----------------------------|-----------------------|
-----------------------------|-----------------------|
-----------------------------|-----------------------|
-7-7-6-6-5-5-5-7--7-6-6-5----|-7-7-6-6-5-5-5-3--7----|
-5-5-4-4-3-3-3-5--5-4-4-3----|-5-5-4-4-3-3-3-3--5----|