relativly simple..

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|-------------------------------------|
|-4-4-4-4--7-7--2-2--4-4-4-4--7-7-2-2-|
|-4-4-4-4--7-7--2-2--4-4-4-4--7-7-2-2-|
|-2-2-2-2--5-5--0-0--2-2-2-2--5-5-0-0-|
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based around that for the majority

bridge bit, play an octave up second time

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|-4-4-4-4-6-6-6-6-7-7-7-7-9-9-9-9----|
|-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x----|
|-2-2-2-2-4-4-4-4-5-5-5-5-7-7-7-7----|
|------------------------------------|