C(10,5,2) = 6
Method of Construction: simple construction: induced on c(11,6,3) covering
Lower Bound: Schonheim
2 3 5 6 8 1 2 4 5 7 1 3 4 6 10 5 6 7 9 10 2 4 8 9 10 1 3 7 8 9