x' // inspection
U R' U2' r z x U R' U R' // cross
z U' U' y' R U R' y' U' R U R' // 1st pair
U' R' U R y U' R' U2' R y U' R U R' // 2nd pair
U2' z U' R U // 3rd pair
z' y U R U2' R' U2' R U' R' // 4th pair
U' R U2' R' U' F' R U2' R' U' R U' R' F R U' R' // COLL
U' U' z U R U' R U' R' U' R U R' U' R' U2' R U // EPLL