x2 y // inspection
U' r U' r' R' D L2' u' // cross
R U R2' U' R // 1st pair
R U U' R' U' R U R' U L U // 2nd pair
L2' U L U' L' U' L // 3rd pair
R U' R' U R U' R2' F R F' // 4th pair
U' U' R U R' U' R' F R2 U R' U' F' // OLL
U' U' F R U' R' U' R U R' F' R U R' U' R' F R F'