The order is: Part A(3x) Part B(1x). Repeat. 

Part A               Part B 
G|----------------|-----------------| 
D|-----1-1-----1--|-----1-1---------| 
A|---------1------|---------2-1-0---| 
E|-2--------------|-2-------------4-| 
   1 &amp; 2 &amp; 3 &amp; 4 &amp;  1 &amp; 2 &amp; 3 &amp; 4 &amp;