Subsets
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R2 U2' R2' U' R2 U2' R2'
visualize
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R2 U2 R2' U R2 U2 R2'
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R U R' F' R U R' U' R' F R2 U' R'
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R U R' U R' U' R2 U' R' U R' U R U2'
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L R U2 L' U R' L U' R U2 L' U2 R'
