AA - 1 combo
KK - 1 combo
AK - 4 combos
AJ - 6 combos
KJ - 6 combos
KT[img]/images/graemlins/heart.gif[/img] - 1 combo
KQ[img]/images/graemlins/heart.gif[/img] - 1 combo
JJ - 3 combos



You need to be 2:1 favourite to 3bet here.
12 combos you beat, 4 you tie, 7 you lose.

I think you can discount a few of the combos you are behind to a point where a 3 bet becomes the right option.