L2 U' B2 D2 L2 F2 U' R2 U' F D B2 L D U' F' U R' D' B2
Solution
x' y2
//
inspection
R' U' F' U' r x' u
//
cross
U' R' U R
//
1st pair
U R U R' z U R' U'
//
2nd pair
z' U' D R U R' U' D'
//
3rd pair
R U' R' U R U' R'
//
4th pair
U' U' R' U' R U' F U' R' U' R U F'
//
ZBLL