riff 1: 

|---9-12-13-10----9-12-13-9----9-12-13-10----9-12-13-10-| 
|-9-------------9------------9-------------9------------| 
|-------------------------------------------------------| 
|-------------------------------------------------------| 

riff 2: 

|---9-12-13-10-12----9-12-13-10-12----9-12-13-18-17----9-12-13-18-17-| 
|-9----------------9----------------9----------------9---------------| 
|--------------------------------------------------------------------| 
|--------------------------------------------------------------------| 

order: 

riff 1 
riff 2  (2x) 
riff 1 
riff 2