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Frappeboy: You don't have to raise to keep seat 4 from getting proper odds. He's only on a 2 card draw if seat 5 has a straight, which he obviously does. The raise will likely drive him out, but you will add more + EV by letting him make the bad call. Right?

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He may have a pocket pair and have 4 outs.

He may call the double bet with whatever he has.

Not even close----Raise.