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---------9-9--7-7--6-6--4-4-4------------6-6--7-6-4-4------------|
-------------------------------6-5-------------------------------|
------------------------------------6-6--------------------------|
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---------9-9--7-7--6-6--4-4-4------------6-6--7-6-4-4------------|
-------------------------------6-5---------------------6-5-------|
------------------------------------6-6--------------------6-6s8-|
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