100NL, small flush on a 4 straight river

[STARSCREAM.]

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If you feel you can call 48 on the river then put the remaining 20 into the pot, he wont be folding a straight and if you're not comfortable playing with 7 high flushes on non paired boards with 4 to the straight out, play only Ax suited....

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I guess you need to spell it out for some people:

I'm not afraid of losing the hand, i'm wondering the best way to extract.