Riff 1:

G----------------------------------------------
D----------------------------------------------
A----------------------------------------------
E--0-0-0-0-3--0-0-0-0-3--0-0-0-0-3--0-0-0-0-0--

Riff 2:

G-------------------------------------------
D-------------------------------------------
A-----------------------5/7-----------------------
E--00000000000000-----000000000000-3/5-3/5--


Riff 3:

G---------|-------------------------|----------------------
D--once---|-----many times----------|-----once-------------
A---------|-------------------------|----------------------
E-5/9-9/0-|-00-0-0-0-0-3--00-0-00---|--000000...--1/12/1---


play riff 1 7-8 times, then riff 2 five times,
then riff 1 7-8 times
then riff 3 once and finish with riff 1 5 times.