Divide the 2nd digit of the lottery numbers (2-21) into 7 parts:
No.1 range: 2 - 4
No.2 range: 5 - 7
No.3 range: 8 - 10
No.4 range: 11 - 13
No.5 range: 14 - 16
No.6 range: 17 - 19
No.7 range: 20 - 21
Divide the 2nd digit of the lottery numbers (2-21) into 7 parts:
No.1 range: 2 - 4
No.2 range: 5 - 7
No.3 range: 8 - 10
No.4 range: 11 - 13
No.5 range: 14 - 16
No.6 range: 17 - 19
No.7 range: 20 - 21