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|------------------------------------------|