There might be more to it but from what I can work out this
riff is simply repeated through the whole of the song:

-/-----------------------------------------------------------------|
-/-----------------------------------------------------------------|
-/-----------------------------------------------------------------|
-/-----------------------------------------------------------------|
-/-7-7-7-7-7-7-7-6-4-4-4-4-4-4-4-2-0-0-0-0-0-0-0-4-2-2-2-2-2-2-4-6-|
-/-----------------------------------------------------------------|
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