z2 // inspection
L D' x U' L U U x' // cross
y' L' L y' U L' U' L // 1st pair
y U' R' U R U' R' U' R // 2nd pair
y' R' U U R U' U' R' U R // 3rd pair
U' R U' U' R' U y' R' U' R // 4th pair
U U F U R U' R' F' U R R' R U R' U R U' U' R' // OLL
R U l' U' x' R U R' U' R' F R2 U' R' U