--------------|
--------------|
--------------|
--------------|   so many times as needed.
-0------0-----|
-0--000-0-----|


This comes before the chorus:

----------------------|
----------------------|
----------------------|
----------------------|
-3--4--5--7/5--3-4-3--|
-1--2--3--5/3--1-2-1--|


I haven't figured out anything else, but almost the whole song is these riffs.