2/4 Party NL: Set over set over set on flop

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...I think the question isn't DO you fold, but more WHEN do you fold this?

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I fold as soon as I put one of them on exactly JJ. Which really isn't going to happen, because I'm thinking I just caught 2 people w/ over pairs or w/ one Jack trying to push people off a flush draw. I think folding QQ here would be acceptable, but not when I caught my middle set. Tough luck on this hand.