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Why do you think the 55's are dirty on the flop? Only an 85 or a set of 6's or 7's have them covered if the turn brings us a set.

The turn adds 98 to the list of worries and is possible holding for SB.

Why do you consider the 5's extremely dirty on the flop and how much would you discount them since you think they're dirty.

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The 5s are dirty because they fill a gutshot str8 for any 8 or 3 and completely counterfeit our str8 draws. While 8 or 3 is not a very likely holding by either villian, it certainly is possible. I could see 88, 33, or 87s here. How much to discount them? Call them 1 or even 1.5 outs?