Intro:
G|---------|
D|---------|
A|---5--55-| Repeat several times
E|-5-------|

Variation 1:
G|--------------------|
D|--------------------|
A|---5--2-3-4-5---5-5-|
E|-5------------5-----|

Variation 2:
G|---------------------------------------------------|
D|---------------------------------------------------|
A|---5----------------------0-1-2--222---------------|
E|-5---2--3--4--55-55-5-5-5------------3-3-3-4-5-----|

Bridge:
G|----------------------------------------------------|
D|----------------------------------------------------|
A|-33---33---33---------------5-----------------------|
E|----5----5----5-3-1-1-0-1-3-------------------------|