COLL
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(R U R' U) (R U' R' U) (R U2' R')
y’ (R U2' R') (U' R U R') (U' R U' R')
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y F (U R U' R')*3 F'
y F (R U R' U')*3 F'
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F (R U' R' U) (R U2' R') U' (R U R' U') F'
f (R U R' U') f' (R U R' U') (R' F R F')
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(R U R' U) R U L' U R' U' L
y2 (L' U' L U') L' U' R U' L U R'