Riff 1 (I know it looks funny but that's how it's played.)
E|---------------------------------------------------------|
B|---------------------------------------------------------|
G|---------------------------------------------------------|
D|--5/3----------2----------1---5/3----------2----------1--|
A|--3/1----------2----------1---3/1----------2----------1--|
E|-------0-0-3-1--------1-2----------0-0-3-1--------1-2----|
pm      . . . .        . .          . . . .        . .

Riff 2
E|---------------------------------------------|
B|---------------------------------------------|
G|---------------------------------------------|
D|--5----4-----7----8-----5----4-----7----8----|
A|--3----2-----5----6-----3----2-----5----6----|
E|--3----2-----5----6-----3----2-----5----6----|

Riff 3
E|------------------------------------------------------------|
B|------------------------------------------------------------|
G|------------------------------------------------------------|
D|------2------2------2---------------2------2------2---------|
A|------2------2------2------3--------2------2------2------3--|
E|--0-0----0-0----0-0----0-0-1----0-0----0-0----0-0----0-0-1--|
pm . .    . .    . .    . .      . .    . .    . .    . .

Riff 4
E|------------------------------------------------------------|
B|------------------------------------------------------------|
G|------------------------------------------------------------|
D|------3---------5------------------3---------5--------------|
A|------1----4----3----3--3-3-3------1----4----3----3--3-3-3--|
E|--0-0----0-2-------0-1--1-1-1--0-0----0-2-------0-1--1-1-1--|
pm . .    .         .           . .    .         .