x2 y // inspection
R' D R D2' R' D R' // cross
y L' U L U R' U2' R U R' U' R // 1st pair
y' R' U R U' F U' F' // 2nd pair
U R U' R' U2 R U' R2' // 3rd pair
U R U' R' U' R U' U' R' U2 R // 4th pair
F (U R U' R')2 F' // OLL
R2' F2 R U2 R U2' R' F R U R' U' R' F R2