Simple, just the three chords F, C, G played repeatedly as F F C G


The lead guitar is the same over each chord, 
i.e. just play the same strings as in the first example but with the other
chord shapes:

Over F chord:

e -   ----1-1-----1-----1-----1-
b -   --------1-----1-----1-----
g -   --2-------2-----2-----2---
d -   3-------------------------
a -   --------------------------