x y // inspection
R U R2 x' u' // cross
y' U' R U2' R' U R U' R' // 1st pair
U' L U L2 U' L // 2nd pair
U' L U2 L' U L U L' // 3rd pair
y U2' R U2' R' U' R U R' U R U' R' // 4th pair
U z R U' R' U R' U' R U R U y' R' U' R x' // OLL
U z' y R2 D2 R U R' D2 R U' R