U D F R' D' R' U R' B R' F2 U2 L2 B2 D2 R' F2 B2 R' B2
Solution
x'
//
inspection
r2' F R' D2 R D' R
//
Xcross
U2' R' U' R
//
2nd pair
U R U2' R' U R U' R'
//
3rd pair
y' U' R U' R' U' R U R' U' R U R'
//
4th pair
R' U2' R2 U R' U' R' U2' r U R U' r' U
//
ELL