z2
//
inspection
(D U') r U' R' U' (x' y) R' D2
//
cross
y' U2 R U' R' U R U R'
//
1st pair
U' R' U R U' y R U R'
//
2nd pair
L U' L' U L U L'
//
3rd pair
U R' U R U' y R U' R'
//
4th pair
U R U2' R2' U' R2 U' R2' U2 R
//
OLL
U' F R' F R U' U R U' R' U' R U R' F' R R' R U R' U' F' U'
//
PLL