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