Riff 1    Riff 2                          Riff 3

..............|------|..|------|...........|------------------------------|..



E|---2--0-0---2--0-0---------0---------0----0------0------0------0------0---|

B|-00-00-0-0---00-0-0---30010-0--300110-0-----0-1-1--0-1-1--0-1-1--0-110-0--|

G|----------0--------0---------0---------0-2-2-2-2--2-2-2--2-2-2--2-2-----0-|

D|--------------------------------------------------------------------------|

A|--------------------------------------------------------------------------|

E|--------------------------------------------------------------------------|



So as you can see the first bit follows the pattern:

2 x Riff1 + 2 x Riff2 + Riff3



The two parts with singing follow the pattern:

Riff1 + Riff2 + 2xRiff1 + 2xRiff2 + Riff3 (there is a little

embellishment here and there)