z2 y // inspection
D R2' F' D L // cross
U2' R U R' U' y R' U' R2 // 1st pair
U2' R' U' y' R U' R' // 2nd pair
R' U2' R U' R' U R // 3rd pair
y' U' R U' R' U R' D' r U r' D R2 U R' // 4th pair
R' U' R U' R' U2 R // OLL
U' U' R' U' R U D' R2 U R' U R2 U' U R' U' R U' R2' D // PLL