What's the probability that the flop missed everyone?

[ctv1116]

OK, here's an interesting theoretical question. Let's say you hold 22 in the BB. It is folded to the button, who limps, and the SB completes, you check. Let's say the flop is K73r. What is the probablity that neither the Button nor the SB holds a pair (including hands like 44 or AA)?

EDIT: I guess the easiest way to do this is to write down every possible hand that beats 22, and calculate the probabilities.

EDIT2: Perhaps this can be extended to what if you held 44? 88? Perhaps this would be helpful in determining postflop decisions with low pairs.