x2 // inspection
U2 L U x' L2' U z' z U' L2' U L2 z' // cross
U R U' U' R' U' R U R' // 1st pair
y2' U R' F R F' R' U' R // 2nd pair
U' U' R U' R' R U U R' U' R R' R U R' U' R U R' // 3rd pair
U' y' U' R U' R' F' U' F // 4th pair (EO)
U R U R' U R U' U' R' // (C)OLL
R2' U R U R' U' R' U' R' U R' U'