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In general this is not the case. Consider a PRF F which ignores the first bit of the key. Then you can distinguish F'(k,.)=F(.,k) from a random function (and thus break its security as a PRF) by querying it on inputs x and x', where with x' we denote x with the first bit flipped. Note that the outputs of F'(k,.) will collide on inputs x and x' as ...

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