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S2 S

Setup R2 D R' U2 R D' R2 U' R U' R'
Setup R2 D R' U2 R D' R2 U' R U' R'

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

RUR'U R2DR'U2RD'R2
U2 RUR' R'F'R U2 RU2R' FRU'R'
U2 r'F2rU2 RU'r' FM' ·
U R'U'RU R2 F'RURU'R'F UR ·

4 of 9 Algorithms