Riff 1

G|------------------------------------|
D|------------------------------------|
A|-------------------7777777777777777-|  
E|-77777777-66666666------------------|

Riff 2

G|------------------------------------|
D|------------------------------------|
A|------------------------------------|   
E|-77777777-66666666-5******-0*******-|

Riff 3

G|-------------------------------------|
D|-------------------------------------|  
A|------------------7777777777777777---|
E|-7777777777777777--------------------|

Riff 4

G|-------------------------------------------------------|
D|-------------------------------------------------------|
A|-------------------------------------------------------|   
E|-77777777-66666666-55555555-00000000-22222222-22222222-|

Riff 5

G|-----------------------------------------------------------------------|
D|-----------------------------------------------------------------------|
A|-----------------------------------------------------------------------|   
E|-77777777-66666666-55555555-00000000-2222222222222222-44444444-55555555|

Riff 6

G|----|
D|----| 
A|----|
E|-77-|  End

Order:

riff 1 x3 
riff 2 x1 
riff 3 x2           play this structure
riff 4 x1           twice, and then this...  
riff 3 x2  
riff 5 x1 
 

riff 1 x3 
riff 2 x1    ...one, on the third time  
riff 6 x1