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I think the fact there is an all-in player substantially reduces the chance that this is a bluff. If he is playing for the sidepot then he really is over betting the pot to win it. The only hands you beat that he makes this play with are a two pair flush draw or an underset. I think thats alot less likely than a 45.

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This is what I was thinking when I folded. Unfortunately, he had 6622 rainbow. Needless to say, I made a note.