15 ≤ C(19,12,4) ≤ 17

Created by: Andrei Ochmat

Lower Bound: Schonheim

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