20 ≤ C(21,12,4) ≤ 25
Created by: Jan de Heer
Method of Construction: Ininuga (by Uros Boltin)
Lower Bound: Schonheim
1 2 3 4 5 6 7 8 9 13 19 21
1 2 3 4 5 6 9 11 15 16 20 21
1 2 3 4 5 6 10 12 14 17 18 21
1 2 3 4 5 7 8 9 10 13 18 20
1 2 3 4 5 8 9 12 14 17 19 20
1 2 3 4 5 8 10 11 15 16 18 19
1 2 3 4 6 7 9 12 15 16 18 19
1 2 3 4 6 7 10 11 14 17 19 20
1 2 3 4 6 8 9 11 12 13 18 20
1 2 3 4 7 8 9 11 14 17 18 21
1 2 3 4 7 8 10 12 15 16 20 21
1 2 3 4 8 9 10 11 12 13 19 21
1 2 3 5 7 11 12 13 14 15 16 17
1 2 4 13 14 15 16 17 18 19 20 21
1 3 4 6 8 9 10 13 14 15 16 17
1 3 9 13 14 15 16 17 18 19 20 21
2 5 6 7 8 9 10 13 14 15 16 17
4 5 7 8 9 11 12 13 14 15 16 17
5 6 7 8 10 11 12 13 14 15 18 21
5 6 7 8 10 11 12 13 14 15 19 20
5 6 7 8 10 11 12 13 16 17 18 19
5 6 7 8 10 11 12 13 16 17 20 21
5 6 9 10 11 12 15 17 18 19 20 21
5 7 8 9 14 15 16 17 18 19 20 21
6 7 9 10 11 12 14 16 18 19 20 21