riff1(opening ,fast)
E|-----------------------------------------------------------------------|
B|-----------------------------------------------------------------------|
G|-----------------------------------------------------------------------|
D|-0---0---0---0---------------------------------------------------------|
A|-7---8---7---8---7-------0---------------------------------------------|
E|-----------------8-------8---------------------------------------------|
riff2
E|---------------------------------------------------------------------|
B|---------------------------------------------------------------------|
G|---------------------------------------------------------------------|
D|-5-7-------7-----5-7-------2-------6---------------------------------|
A|---0-------8-------0-------3-------7---------------------------------|
E|---------------------------------------------------------------------|
riff3(fast)
E|---------------------------------------------------------------------|
B|---------------------------------------------------------------------|
G|---------------------------------------------------------------------|
D|-7-------7-10-9-7-7-------2-------6----------------------------------|
A|-0-------8--8-8-8-0-------3-------7----------------------------------|
E|---------------------------------------------------------------------|
it all goes like this(i'm not sure about that):
riff1
riff2
riff3
riff1
riff2
riff3