12 ≤ C(15,10,4) ≤ 14

Method of Construction: dynamic programming covering

Lower Bound: Schonheim

  1  2  3  4  5  6  7  8  9 10
  1  2  3  4  5  6  7  8  9 11
  1  2  3  4  5  6  7  8  9 12
  1  2  3  4  5  6  7  8  9 13
  1  2  3  4  5  6  7  8  9 14
  1  2  3  4  5  6  7  8  9 15
  1  2  3  4 10 11 12 13 14 15
  1  5  6  7 10 11 12 13 14 15
  2  5  8  9 10 11 12 13 14 15
  3  4  6  8 10 11 12 13 14 15
  3  4  7  9 10 11 12 13 14 15
  1  2  6  9 10 11 12 13 14 15
  1  2  7  8 10 11 12 13 14 15
  1  3  4  5 10 11 12 13 14 15