it starts off with

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-7-7-7-7-7-7-7-9-10-10-10-10-10-10-10-9-|
----------------------------------------|
----------------------------------------|

and then goes to

-----------------------------------------|
-7-7-7---7-7-7-9-10-10-10---10-10-10-9---|
-------7-----------------10--------------|
-----------------------------------------|

repeat that for most of the song