before the G is played (if you listen to the song) there are two notes played before the G so I'll write some made up tabs so you get the picture..this is hard to explain in words so I hope you understand
C---Em---then the new tabs are each played only once
x= don't play those strings
e--x--|--x--|
b--x--|--x--|
g--0--|--0--| -> Then just move the low e finger to fret 3
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