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