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