54s on a 6h5h4h flop.

[brettbrettr]

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I also have to worry about a 3 or a 7.

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So? No one is folding on the flop, or the turn for that matter with either of these holdings. You're getting more money in on the turn when they don't hit. If you got shown a better 2 pair, fine, don't sweat it. But not raising this hand if giving up too much IMO.