27 ≤ C(17,9,4) ≤ 28
Method of Construction: covering provided by rade belic
Lower Bound: Schonheim
1 2 3 4 5 6 7 16 17
1 2 3 8 9 10 11 16 17
1 2 3 12 13 14 15 16 17
1 2 4 5 7 8 11 13 14
1 2 4 6 7 8 12 13 15
1 2 4 6 7 9 10 11 14
1 2 5 9 10 11 12 13 15
1 3 4 6 9 11 12 14 15
1 3 4 8 10 11 12 13 14
1 3 5 6 7 8 10 11 15
1 3 5 6 7 9 12 13 14
1 4 5 8 9 12 13 16 17
1 4 5 10 11 14 15 16 17
1 6 7 8 9 14 15 16 17
1 6 7 10 11 12 13 16 17
2 3 4 5 6 8 9 11 12
2 3 4 5 6 10 13 14 15
2 3 6 7 8 9 10 12 13
2 3 7 8 9 11 13 14 15
2 4 6 8 10 12 14 16 17
2 4 6 9 11 13 15 16 17
2 5 7 8 10 13 15 16 17
2 5 7 9 11 12 14 16 17
3 4 7 8 11 12 15 16 17
3 4 7 9 10 13 14 16 17
3 5 6 8 11 13 14 16 17
3 5 6 9 10 12 15 16 17
4 5 7 8 9 10 12 14 15