I use this for A Permutation : a
R' F R' B2 R F' R' B2
A Permutation : b
I just inverse Permutation A but I do it in a weird position, like L F' L B2 L' F L B2 L2
Edit:
I found out its the M slices that slow me down.
Edit:
I found new finger trick that speeds me up
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