z y2 // inspection
U' F' r R2 U' x' U r // cross
x U R' U' x' U R' U' l U' R' U // 1st pair
x' R' R U' R' U R' U' R U2 R' U' // 2nd pair
U' R' U l' U l F' // 3rd pair
x' U R' U' R2 U l' f' // 4th pair
U' F' r U R' U' L' U l // OLL
U' R U R' F' R U R' U' R' F R2 U' R' U // PLL