This is the main structure
E|-----------------------------|
B|-----------------------------|
G|-----------------------------|
D|-9-9-9-9-9-------5-5-5-7-7-7-|
-7-7-7-7-7-5-5-5-3-3-3-5-5-5-|
E|-----------7-7-7-------------|

Then it goes:

E|----------------------|
B|----------7-7b---7-7--|
G|----------7-7b---7-7--|
D|-7-7-7-7-7----7-7-----|
A|-5-5-5-7-7----5-5-----|
E|----------------------|