As I understand the 2,4,6,8,12 are just distance on the wheel layout CW or CCW direction from last spin number.


Example: 10, 14


*** CW  7 Red : Bet numbers -->  18 (CW4), 7 (CW6), 12 (CW8), 3 (CW10), 32 (CW12)
From number 14 to 32 is CW13 but 0 not counted.