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Villain's 45 bet on the flop is too small to fold to. Call and gauge on the turn.

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I agree completely with this. Some bad players at the 20's will stop firing shots after the flop and then it's your time to fire back.

Plus you have more than just 3 kings that can win you this pot. Don't discount the possibility of getting another club to give you more outs by the river if your opponent is going to bet out such small amounts.