lower bound = 7

C(11,5,2) = 7

Method of Construction: random greedy covering

Lower Bound: Schonheim

  1  6  7  9 10
  1  2  4  5 11
  3  5  6  8 10
  2  3  7  8  9
  4  5  7  9 11
  2  4  6 10 11
  1  3  4  8 11