C(26,6,2) = 24
Method of Construction: found by a hill-climbing program
Lower Bound: Handbook of Combinatorial Designs section on coverings
5 6 7 10 18 20
11 15 19 20 23 24
1 4 12 16 17 20
3 9 20 21 25 26
3 5 7 8 17 23
7 11 13 14 16 26
1 7 9 13 19 26
2 8 13 14 20 22
1 8 16 18 21 24
1 5 9 11 14 26
13 14 15 17 18 25
2 5 7 12 24 25
4 5 7 15 21 22
5 9 13 14 16 19
3 11 12 18 19 22
6 12 13 14 21 23
3 4 10 13 14 24
6 9 17 22 24 26
1 10 16 22 23 25
1 2 3 6 15 16
8 9 10 12 15 26
4 6 8 11 19 25
2 10 11 17 19 21
2 4 9 18 23 26