12 ≤ C(26,14,3) ≤ 13

Method of Construction: simple construction: multiple of smaller covering

Lower Bound: Schonheim

  2  3  5  6  7  8  9 15 16 18 19 20 21 22
  1  2  3  4  5  7 10 14 15 16 17 18 20 23
  1  4  5  6  8  9 10 14 17 18 19 21 22 23
  1  2  3  6  7 11 12 14 15 16 19 20 24 25
  3  4  6  7  8 11 12 16 17 19 20 21 24 25
  2  4  6  9 10 11 12 15 17 19 22 23 24 25
  1  3  8  9 10 11 12 14 16 21 22 23 24 25
  1  2  4  7  8  9 13 14 15 17 20 21 22 26
  2  3  6  7  8 10 13 15 16 19 20 21 23 26
  1  3  4  6  9 10 13 14 16 17 19 22 23 26
  1  3  4  5 11 12 13 14 16 17 18 24 25 26
  2  5  6  8 11 12 13 15 18 19 21 24 25 26
  5  7  9 10 11 12 13 18 20 22 23 24 25 26