This riff is played during the intro
e------------------------------------------|
B--6-6-5-3-5---5-6-8-----------------------|
G--------------------5--------5-7-7/9-5----|
D---------------------------7--------------|
A------------------------------------------|
E------------------------------------------|

These other 2 riffs are played randomly in parts of the song.
e------------------------------------------|
B--6-6-5-3-5---5-6-8-----------------------|
G--------------------5/7-5----5-7-7/9-5----|
D---------------------------7--------------|
A------------------------------------------|
E------------------------------------------|

e------------------------------------------|
B--6-6-5-3-5---5-6-8-----------------------|
G--------------------5-----5-7-7/9-5-4-5---|
D------------------------7-----------------|
A------------------------------------------|
E------------------------------------------|