31 30 15 14 7 () () 1 7 8 14 15 21 22 () () this is to find rules

31 30 15 14 7 () () 1 7 8 14 15 21 22 () () this is to find rules

31 30 15 14 7 (6)(3)
Law: odd minus 1 to get even, even divided by 2 to get singular
1 7 8 14 15 21 22 (28)(29)
Rule: add 6 and 1