(A)

E|--------------------------------------------------------|
B|--------------------------------------------------------|
G|---1"----------4"----1"---------------------------------|
D|----------4"----------------------2"----4"--------------| (x 2)
A|---------------------------4"---------------------------|
E|--------------------------------------------------------|

(B)
for the next bit hammer on.  

E|--------------------------------------------------------|
B|--------------------------------------------------------|
G|---4h6---(x12)----6~-4----------------------------------| x2
D|------------------------6--4~---------------------------|
A|--------------------------------------------------------|
E|--------------------------------------------------------|

(C)

E|--------------------------------------------------------|
B|--------------------------------------------------------|
G|--4h6-6"------4h6-6"-------4h6-6"----4"-----------------| x2
D|--------------------------------------------------------|
A|--------------------------------------------------------|
E|--------------------------------------------------------|


Back to Main Riff (A), repeat all of above

then

E|--------------------------------------------------------|
B|----------7-------5~--5~-----------7-------5~---4~------|
G|--6--6-6-----6-------------6--6-6-----6-----------------| x 2
D|--------------------------------------------------------|
A|--------------------------------------------------------|
E|--------------------------------------------------------|


E|--------------------------------------------------------|
B|--------7-----5"-------------7-------5"----4"-----------|
G|-6-6-6----6---------6-6-6------6------------------------| x 2
D|--------------------------------------------------------|
A|--------------------------------------------------------|
E|--------------------------------------------------------|


E|--------------------------------------------------------|
B|---------7-------5"-------------7--------5"----4"-------|
G|-6"----------6-------------6"--------6------------------| x 2
D|--------------------------------------------------------|
A|--------------------------------------------------------|
E|--------------------------------------------------------|


back to main riff (A)


finish with:

E|-------|
B|-------|
G|-------|
D|---6---|
A|---4---|
E|-------|