The difference between the 1st and 2nd digits is divided into 5 portions

The difference between the 1st and 2nd digit of the lottery numbers is divided into 5 parts.

Part 1: 1 - 5

Part 2: 6 - 9

Part 3: 10 - 13

Part 4: 14 - 17

Part 5: 18 - 21