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