Riff 1:  The 4's are played 8 times in the intro only and are played 4 times in the rest of the song 
G-------------------------------------------------------------------------------------------------------------
D-------------------------------------------------------------------------------------------------------------
A------------5-5-----------------------5-5---7-7---------------------5-5-----------7-7-7-7---4-4-4-4-4-4-4-4--
E-2-2-2-2------5-5-----2-2-2-2-----------------------2-2-2-2----------5-5-------------------------------------

Riff 2:
G-------------------------------------------------------------------------------------------------------------
D-------------------------------------------------------------------------------------------------------------
A--------------------------7-7-7-7----------------------------------------7-7-7-7-4-4-4-4---------------------
E---2-2-2-2---5-5-5-5-------------7-7-7-7------2-2-2-2-5-5-5-5------------------------------------------------

Riff 3:
G-------------------------------------------------------------------------------------------------------------
D-4-4-4-4-------------------------------------4-4-4-4---------------------------------------------------------
A--------------------------7-7-7-7------------------------------------7-7-7-7-4-4-4-4-------------------------
E--------------5-5-5-5--------------7-7-7-7--------------5-5-5-5----------------------------------------------

Riff 4:
G-------------------------------------------------------------------------------------------------------------
D-------------------------------------------------------------------------------------------------------------
A--------------------------7-7-7-7-4-4-4h5p4------------------------------------------------------------------
E-2-2-2-2-5-5-5-5---------------------------------------------------------------------------------------------

Order:
Riff 1: 3x
Riff 2: 1x
Riff 3: 1x
Riff 1: 1x
Riff 2: 1x
Riff 3: 1x
Riff 4: 6x
Riff 2: 2x   
Riff 3: 2x