16 ≤ C(28,13,3) ≤ 19
Method of Construction: simple construction: induced on c(29,14,4) covering
Lower Bound: Schonheim
1 2 3 4 7 8 10 13 14 16 17 23 26
7 9 10 11 12 13 15 16 18 21 22 23 26
5 6 8 10 12 14 15 17 18 23 24 26 27
6 7 10 13 16 19 20 23 24 25 26 27 28
1 2 6 7 9 12 17 18 19 21 26 27 28
1 2 5 6 7 11 15 17 20 22 24 25 26
3 4 5 9 13 15 16 17 19 21 24 26 28
3 4 7 8 9 12 14 18 20 21 24 25 26
3 4 6 7 8 11 14 15 19 22 26 27 28
1 3 5 6 7 8 9 10 11 12 13 25 28
1 3 6 9 10 11 14 15 16 17 18 19 20
1 3 10 12 14 16 17 21 22 24 25 27 28
2 4 8 9 10 11 15 16 18 24 25 27 28
2 4 5 6 8 10 12 16 19 20 21 22 24
2 3 5 7 9 13 14 18 20 22 23 27 28
1 4 6 8 9 13 17 18 19 22 23 24 25
1 4 5 7 11 14 16 18 19 21 23 25 27
1 4 8 11 12 13 15 17 20 21 23 27 28
2 3 6 11 12 13 14 15 19 21 23 24 25