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