B2 U' R2 D B2 D2 U' R' D2 B' F U' R' D' R2 U L F2 L
y // inspection
F L F' U R u // cross
L' U' L // 1st pair
R U' R' U R' U' R2 // 2nd pair
U' R' d R' U2' R U R' U2' R // 3rd pair
d R' D' R U' R' D R U R U' R' // 4th pair
U' U' R' U' R U' R' U R U R' F R U R' U' R' F' R2 U' // ZBLL