C(27,6,2) = 27
Method of Construction: cyclic covering found by search program
Lower Bound: Schonheim
1 2 3 6 14 23
2 3 4 7 15 24
3 4 5 8 16 25
4 5 6 9 17 26
5 6 7 10 18 27
1 6 7 8 11 19
2 7 8 9 12 20
3 8 9 10 13 21
4 9 10 11 14 22
5 10 11 12 15 23
6 11 12 13 16 24
7 12 13 14 17 25
8 13 14 15 18 26
9 14 15 16 19 27
1 10 15 16 17 20
2 11 16 17 18 21
3 12 17 18 19 22
4 13 18 19 20 23
5 14 19 20 21 24
6 15 20 21 22 25
7 16 21 22 23 26
8 17 22 23 24 27
1 9 18 23 24 25
2 10 19 24 25 26
3 11 20 25 26 27
1 4 12 21 26 27
1 2 5 13 22 27