C(15,12,2) = 3
Created by LJCR
Method of Construction: Multiple of (5,4,2) covering
1 2 3 4 6 7 8 9 11 12 13 14 1 2 3 5 6 7 8 10 11 12 13 15 1 2 4 5 6 7 9 10 11 12 14 15