C(13,6,2) = 7
Method of Construction: lex covering
Lower Bound: Schonheim
1 2 3 4 5 6 1 7 8 9 10 11 2 3 7 8 12 13 4 5 9 10 12 13 2 3 6 9 10 11 4 5 6 7 8 11 1 2 6 11 12 13