L B L B' R' U' B U' L

x y2 R' r' b R' r' R r // white layer
(*) r' R r R' R r' R' r z R r' R' r z r' R r R' z r' R r R' // rest (off by a U perm)

z2 y' r' R r R' z2 r' R r R' // fix

(*) and on should have been: r' R r R' z r' R r R' z R r' R' r