C(10,4,2) = 9
Method of Construction: lex covering
Lower Bound: Bounds for fixed number of blocks
1 2 3 4 1 5 6 7 1 8 9 10 2 3 5 8 2 3 6 9 2 3 7 10 4 5 6 10 4 7 8 9 5 6 8 9