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