On this exercise you haveto use your index finger and your middle finger to pop. When 
you do it, try not to curl your fingers under the string too much because you wont be able 
to do it fast enough
played in all slap and pop 

standard tuning

p1=pop with index finger
p2=pop with middle finger
               p1 p2       p1 p2           p1 p2        p1 p2         p1 p2    p1 p2    p1 p2                        
G|—————————————12—12———————12—12———————————11—11———————11—11——————————9—9——————9—9——————8—8—————8—8—|
D|————————————————————0h14————————————————————————0h12————————————————————0h11——————————————0h9—————|
A|————————0h14———————————————————————0h12————————————————————————0h11———————————————0h9—————————————|
E|——————————————————————————————————————————————————————————————————————————————————————————————————|

make sure you play it as fast as you can or else you wont get the full exercise
good luck