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