B2 D B2 F2 D R2 D' U' B2 R2 U' R' F R2 B' U2 B' U L U' B'
Solution
inspection
U R' y' R' U' r R' U x' D2'
//
cross
y' R' U' R2 U R'
//
1st pair
R' U R y' R U' R' U' R U R'
//
2nd pair
y' R U R' y' R U2' R' U R U' R'
//
3rd pair
R' U R
//
4th pair
U' U U R U2' R2' F R F' R U2' R' U'
//
OLL