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aS4 aS

Setup M F R' F' r U2 R U2 R'
Setup M F R' F' r U2 R U2 R'

Recognition: Checkerboard; three cycle clockwise, back-right stays.

R'U'RU' R2D'RU2R'DR2
U2 R'U'RU R'FRUR'U'R'F'R R
RU2R' U2 r'FRF' M'
U2 SU2 RU2R' U2 R'FRf' ·

4 of 8 Algorithms