B R2 F' D2 B D2 L2 F R2 F' U2 F D B L' B' L2 B F2 U' B'
z y // inspection
R U F2' r' R' // cross
U' y R' U' R U R' U R U2' R' U R // 1st pair
y' R U' R' d R' U R // 2nd pair
y2' R' F' R U R U' R' F // 3rd pair
y R' U R U' R' U R // 4th pair
U2' R' U' U' R U R' U R2 U R' U R U2' R' U2' // ZBLL