20 ≤ C(40,10,2) ≤ 21
Created by: LJCR
Method of Construction: Multiple of (20,5,2) covering
Lower Bound: Schonheim
1 2 3 4 5 21 22 23 24 25
1 2 7 15 16 21 22 27 35 36
1 2 11 14 17 21 22 31 34 37
1 3 8 12 20 21 23 28 32 40
1 4 9 10 19 21 24 29 30 39
1 5 6 13 18 21 25 26 33 38
1 6 7 8 9 21 26 27 28 29
1 10 15 18 20 21 30 35 38 40
1 12 13 16 19 21 32 33 36 39
2 6 10 11 12 22 26 30 31 32
2 8 14 18 19 22 28 34 38 39
2 9 13 17 20 22 29 33 37 40
3 6 15 17 19 23 26 35 37 39
3 7 10 13 14 23 27 30 33 34
3 9 11 16 18 23 29 31 36 38
4 6 14 16 20 24 26 34 36 40
4 7 12 17 18 24 27 32 37 38
4 8 11 13 15 24 28 31 33 35
5 7 11 19 20 25 27 31 39 40
5 8 10 16 17 25 28 30 36 37
5 9 12 14 15 25 29 32 34 35