[ArturiusX]

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Raise hand 3. There is a good chance he's betting a straight.

Hand 4, check the river and fold. There is a good amount of cards that beat you (I won't bother to count them like the other nerds on this forum). I know it's hard folding a set, but sometimes it's necessary. This is one of those times.

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Search for Clarkmeister's theory. It essentially says, bet the river/fold to a raise is easily the best line for the 4 flush.