--------------------------------------------------------------------------l
--------------------------------------------------------------------------l
--------------------------------------------------------------------------l
------(b9)-(b9)-x--11--11--11---(b9)-(b9)-----------------------------------------l
------(b9)-(b9)-x--11--11--11---(b9)-(b9)-----and repeat that for a while---------l
------7--7--x--(b9)--(b9)--0----7--7------------------------------------------l