System - 16 numbers, 20 bets 

We select 16 numbers from 70 and 5 numbers from 25 additional numbers. The selected 16 numbers from 1 to 70 are substituted in place of the numbers in the system from 1 to 16, while the selected 5 numbers from 1 to 25 are substituted in place of the numbers in the system from 1 to 5

5 z 16 1 z 5
1 2 4 14 15 3
1 6 10 11 14 1
1 6 10 11 15 2
1 3 4 14 16 4
1 9 11 13 14 2
1 9 11 13 16 3
2 4 6 10 11 5
2 5 6 12 15 2
2 7 8 10 12 5
2 7 8 10 15 1
3 4 9 11 13 1
3 5 7 13 16 1
3 8 9 12 13 4
3 8 9 12 16 5
5 6 7 8 10 4
5 7 8 9 12 3
6 10 11 14 15 4
7 8 10 12 15 3
8 9 12 13 16 2
9 11 13 14 16 5

Replace the numbers from 1 to 16 with your own selected 16 numbers from the range 1 to 70 and the numbers from 1 to 5 with your own selected 5 numbers from the range 1 to 25