1 e + a 2 e + a 3 e + a 4 e + a
e-----------------4----4----4-----|
B-4-6-4-4-6-4-----4----4----4-----|
G---------------------------------|
D---------------------------------|
A---------------------------------|
E---------------------------------|

  1 e + a 2 e + a 3 e + a 4 e + a
e-----------------4----4----4-----|
B-4-6-4-4-6-4-----4----4----4-----|
G---------------------------------|
D---------------------------------|
A---------------------------------|
E---------------------------------|

  1 e + a 2 e + a 3 e + a 4 e + a
e-4-6-4-4-6-4-----4----4----4-----|
B-----------------4----4----4-----|
G---------------------------------|
D---------------------------------|
A---------------------------------|
E---------------------------------|

  1 e + a 2 e + a 3 e + a 4 e + a
e-4-6-4-4-6-4-----4----4----4-----|
B-----------------4----4----4-----|
G---------------------------------|
D---------------------------------|
A---------------------------------|
E---------------------------------|

As always, repeat ad infinitum