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						People,
 In my experience if a 4-card straight or a 4-card flush gets there on the river and someone bets into you like this, a significant majority of the time they have the hand.  If I had the jack, I would definitely bet out, because I would be thinking, if this guy doesn't have a straight, he'll just check behind, so the only way I'll get paid is if I bet.
 
 That being said, I'm sure some people would check with a jack, hoping to check-raise you.  It'd be a pretty bad play but people do it all the time anyway.  I think betting 30 like this guy did, is also bad, no matter what he has.  I would bet at least 100 if I were him.
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