---------------------------------------------------------------------------|
---------------------------------------------------------8-8---------------|
-------(b9)(b9)(b9)(b9)------------------------7-7-7-7-----------7-7---------------|
-------(b9)(b9)(b9)(b9)----------7-7-----------7-7-7-7-----------5-5---------------|
-------7-7-7-7-----------7-7-----------5-5-5-5-----------------------------|
-------------------------5-5-----------------------------------------------|