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i would also just call the turn.

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I definitely raise the turn. Villain could have a pair of fives or a lower pocket pair, and might even be encouraged to fold a pair of eights. He could also be (correctly) taking a stab at this pot with nothing. You have a pair and a strong draw, but taking this down before showdown would be sweet. Raising also lets you shut out the third player, who again could fold a better hand less than kings or a draw. (Straight draws cannot call a turn raise profitably.)