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Divide the 1st digit of the lottery numbers (1-20) into 7 parts:

No.1 range: 1 - 3

No.2 range: 4 - 6

No.3 range: 7 - 9

No.4 range: 10 - 12

No.5 range: 13 - 15

No.6 range: 16 - 18

No.7 range: 19 - 20