y' // inspection
R B' R2' D F R2 // cross
U' R U R' d' R' U' R // 1st pair
U y' U2' R U' R' U' L' L L' U' L // 2nd pair
y L' U L U' L' U L // 3rd pair
R U R' U' R U' R' y' R' U R // 4th pair
R U2' R2' U' R2 U' R2' U2' R // COLL
R U' R U R U R U' R' U' R2 U