Since the corners are affected by the move F like F 1 2 3 4 5 6 7 9 the sequence FRBL does FRBL 1 7 2 4 3 6 5 8 that is four 2 cycles so FRBL2 will return the corners to their original combination ignoring twists for now For the edges FRBL 1 2 3 5 6 8 9 11 12 4 10 7 a 9 cycle and a 3 cycle The lowest common multiple LCM of a 9 cycle and a 3 cycle is a 9 cycle hence the edges will be returned to their original combination by FRBL9 ignnoring flips The LCM of a 2 cycle and a 9 cycle is a 18 cycle hence M FRBL18 72 moves is required to return both corners and edges to their original combination However if they do not return with the correct twists and flips haven t checked can t be bothered too much effort but I seem to remember from my now highly unreliable memory that when I actually tried this move over 30 years ago it did twist and flip then the sequence will have to be repeated to correct this Twists are 3 cycles and flips are 2 cycles The LCM of both is a 6 cycle hence M6 FRBL108 432 moves A tediously long sequence but obviously much less than a complete solution since only 432 different positions are achieved User talk Spinningspark Spark