F2 D2 R2 U' L2 D R2 U B2 R B2 D' B' U' R B F L2 U B'
z' // inspection
r2 U' r' u // cross
R' U' R // 1st pair
d U2 U' R U R' U' L' U L // 2nd pair
U' U' R U' R' U R U' R' // 3rd pair
U R' U R U d' R U' R' U' R U' R' U R U' R' // 4th pair
R U R' U R U' R' U R U' U' R' U' R U R' U R U' R' U R' U' R2 U' R2' U' U' R U2 // ZBLL
