11 ≤ C(24,16,4) ≤ 12

Method of Construction: simple construction: multiple of smaller covering

Lower Bound: Schonheim

  2  3  4  5  6  7  8  9 14 15 16 17 18 19 20 21
  2  3  4  5  6  7  8 10 14 15 16 17 18 19 20 22
  2  3  4  5  6  7  8 11 14 15 16 17 18 19 20 23
  2  3  4  5  6  7  8 12 14 15 16 17 18 19 20 24
  1  2  3  4  5  6  7  8 13 14 15 16 17 18 19 20
  1  2  3  4  9 10 11 12 13 14 15 16 21 22 23 24
  1  2  5  6  9 10 11 12 13 14 17 18 21 22 23 24
  1  2  7  8  9 10 11 12 13 14 19 20 21 22 23 24
  1  3  5  7  9 10 11 12 13 15 17 19 21 22 23 24
  1  3  6  8  9 10 11 12 13 15 18 20 21 22 23 24
  1  4  5  8  9 10 11 12 13 16 17 20 21 22 23 24
  1  4  6  7  9 10 11 12 13 16 18 19 21 22 23 24