Backdoor

E|-5--4--------------------------
B|-------2-------2--3--2---------
G|-----------------------4--2--1-
D|-------------------------------
A|-------------------------------
E|-------------------------------

E|5--4----------------------------------------| 
B|------2---------2--3--2---------------------| 
G|------------------------4--2--1-2-----------| 
D|--------------------------------------------| 
A|--------------------------------------------| 
E|--------------------------------------------| 

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i think the bass is playing these root notes:
G|---------| 
D|---------| 
A|---4---4-| 
E|-2---5---|