This algorithm due to Patrick Bossert flips two pairs of edge pieces (all in the same middle slice) from one side of the cube to the other.
Hold the cube so that the slice containing the edges to be permuted is between the front and back slices, and perform this algorithm:
R2 M2 R2 M2
Here M means the slice between the front and back slices.
Негізгі бет Rubik’s Cube Algorithm: permuting two pairs of edge pieces in the middle slice
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