C(19,6,2) = 15

Method of Construction: random greedy covering

Lower Bound: Schonheim

  4  6  8  9 10 19
  2  3  6  7 13 17
  5  8 11 13 15 18
  1  4  5 12 14 16
  1  2  9 14 17 18
  3  7 12 16 18 19
  1  3  7 10 11 14
  2 10 12 15 16 17
  2  4  5 11 17 19
  1  6 13 14 15 19
  6  9 11 12 13 16
  3  4  5  7  9 15
  4  5  6 10 13 18
  1  3  7  8 12 16
  2  8 14 15 16 17