F R2 B' D2 L2 D2 L2 F R F' D R2 B' R B U2 R' D2 R'

y2 // inspection
R2 x' (U' D) x D2 // cross
R U R' U2' R U' R' // 1st pair
y' U2' R U R' U R U' R' // 2nd pair
y' U2' R U R' z R2 U' R' U R U' R2 U z' // 3rd pair
y' R' U' R // 4th pair
U R' U2' R2 U R2 U R U' R U R' U' R U' R' U // ZBLL