14 ≤ C(26,13,3) ≤ 15
Method of Construction: simple construction: deleted element from c(v+1,k,t) covering
Lower Bound: Schonheim
1 3 5 10 12 14 16 17 19 21 22 24 25
3 4 7 8 10 13 15 18 19 20 21 22 24
4 6 7 11 12 14 15 16 18 19 21 23 25
2 6 8 9 12 13 14 15 16 20 21 25 26
1 2 3 4 10 12 15 18 19 20 23 25 26
1 4 5 8 11 12 13 15 16 17 20 21 23
3 5 6 9 10 11 14 15 16 17 18 19 20
1 2 5 6 7 9 12 17 18 19 21 22 26
2 5 7 11 15 16 17 18 20 22 24 25 26
1 2 8 11 12 13 14 16 18 19 22 24 26
4 5 6 8 9 13 17 18 19 22 23 24 25
1 3 6 7 8 9 10 11 12 13 16 17 25
2 3 4 6 9 10 11 16 21 22 23 24 26
2 3 4 5 7 8 10 13 14 16 17 23 26
1 4 6 7 9 12 14 15 16 20 22 23 24