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However, if we do a U', you can see that the cube now has 3 unsolved edges and 3 unsolved corners. 2 unsolved items suggests odd parity, considering the fact that we are able to fix them with 1 swap: buffer to B. And after a U', these 3 unsolved items might be solved with 2 swaps: buffer to D into a. So, fixing an odd parity scramble just calls for