C(13,8,4) = 18

Method of Construction: random greedy covering

Lower Bound: Schonheim

  2  3  5  7  8 10 12 13
  1  2  4  5  6  7  9 11
  3  4  6  8  9 10 11 13
  1  3  5  6  7 10 11 12
  1  2  4  7  8  9 12 13
  1  2  5  6  8 11 12 13
  1  2  3  4  7 10 11 13
  3  4  5  6  7  8  9 12
  1  2  3  6  7  8  9 10
  4  5  7  9 10 11 12 13
  2  4  6  7  8 10 11 12
  1  2  3  4  5  6 12 13
  1  3  5  7  8  9 11 13
  1  4  5  6  7  8 10 13
  2  3  6  7  9 11 12 13
  2  3  4  5  8  9 10 11
  1  3  4  8  9 10 11 12
  1  2  5  6  9 10 12 13