J = R U R' F' R U R' U' R' F R2 U' R' U' = R2 D' R' D R' B2 L U' L' B2 and [a : b] = a b a'

flip U edges (14)
[y' : J] [z : J] [x' y' : J] [x' y : J] [x' y2 : J] [z y2 : J] [x y2 : J] [z y2 : J] [x' y : J] [z' y2 : J] [x' y' : J] [x' : J] [z : J] [y : J]

superflip - at least 19