6-Max : Reraising with JJ preflop

[sourbeaver]

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2) Set or not bet, unless I flop an overpair in position. Then I will challenge a continuation bet and try to get to a cheap showdown if called.

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Time for another question (which is adressed to everyone):

You call preflop w JJ, flop comes 268r and it's checked to you, do you bet or check behind ? (1/2, 3/4 pot ? full ?)
Fold if C/R'ed ?
Plan if flat called ?