riff a

|------------------------------------------------------------------|
|------------------------------------------------------------------|
|---------77777777--------77777777--------99999999-----------------|
|-7777777777777777777777777777777777777777999999997777777777777777-|
|-7777777755555555777777775555555577777777777777777777777777777777-|
|-55555555--------55555555--------55555555--------5555555555555555-|   (x3)

riff b

|------------------------------------------------------------------|
|------------------------------------------------------------------|
|------------------------------------------------------------------|
|-2222222222222222222222222222222222222222222222222222222222222222-|
|-2222222222222222222222222222222222222222222222222222222222222222-|
|-0000000000000000000000000000000000000000000000000000000000000000-|   (x1)

outline:
riff a x1
riff b x1
riff a x1    |---|
riff b x1    |---|
riff a x1    |---|
riff b x1    |-7-|
             |-7-|
song ends on |-5-|

this is my first tab, hope it helped, emjoy...