X Depthwise

BL - edge FL

LF'L'FLUL'

done as RwU'Rw'FLUL'

BR - edge FR

R'FRF'R'U'R

FL - edge BL

L'BLB'L'U'L

(U)LU'L2'U'LFUF'

from Lars Vandenbergh

FR - edge BR

RB'R'BRUR'

(U')R'UR2UR'F'U'F

from Lars Vandenbergh