R2 B2 L' U2 L R' D2 U2 R' B U' R F2 L B L2 D' R' F U'
Solution
x2 z
//
inspection
D U' z U D z' u' U R
//
cross
z U' R U
//
1st pair
z' U' U' R' U' R U z U R' U'
//
2nd pair
z' U R' U' U' R U' R' U R
//
3rd pair
z x' z' R' U R U' R' U' R
//
4th pair
r U R' U' z U' z' U R U'
//
ZBLL