C(25,4,2) = 50
Method of Construction: simple construction: induced on c(26,5,3) covering
Lower Bound: Schonheim
1 9 17 25
3 8 15 19
14 16 18 20
3 9 23 24
6 18 19 22
12 14 19 23
2 9 13 16
6 9 14 21
5 15 20 23
10 13 22 23
15 16 21 22
15 17 18 24
1 3 12 22
5 10 19 25
7 11 16 23
3 7 10 18
3 17 20 21
7 13 17 19
4 11 18 25
4 9 10 15
2 19 21 24
2 11 12 15
4 6 17 23
2 10 14 17
1 2 18 23
8 11 17 22
1 5 8 14
9 11 19 20
4 8 13 20
1 6 13 15
7 14 15 25
4 7 12 21
1 7 20 24
2 3 4 5
2 20 22 25
5 6 11 24
8 9 12 18
12 13 24 25
5 12 16 17
3 6 16 25
3 11 13 14
1 4 16 19
6 10 12 20
8 21 23 25
8 10 16 24
2 6 7 8
4 14 22 24
1 10 11 21
5 13 18 21
5 7 9 22