Simple song really, it just loops two bars, use either whenever, the both fit the whole song:

G|----------------------------|
D|--------3--3------------2---|
A|--0--0--------3--3--2-3---3-|
E|----------------------------|

And you can put this one in too, I usually use it at the end of verses but it can go anywhere:

G|----------------------------|
D|--------3--0------------2---|
A|--0--0--------3--3--2-3---3-|
E|----------------------------|