y' x' // inspection
U M' x' F F x' F // cross
U' U' R' U R2 U' U R U' R' U y r U2 r' // 1st pair
U' R U' U' R' U' R U R' // 2nd pair
y R U' R' y U L' U L // 3rd pair
U' R U' R' // 4th pair
R' U' F' R' R U F R // OLL
U' R2 u' R U' R U R' u R2 y R U' R' U'