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eff 13 Jan 2021 Log in to Reply alternative 4-flip alg S’ R U R’ S U’ R’ F R F’ (or its inverse) R’ F2 R2 U2′ R’ F* R U2′ R2′ F2 R
alternative 4-flip alg
S’ R U R’ S U’ R’ F R F’ (or its inverse)
R’ F2 R2 U2′ R’ F* R U2′ R2′ F2 R