38 ≤ C(26,9,3) ≤ 39

Method of Construction: simple construction: deleted element from c(v+1,k,t) covering

Lower Bound: Schonheim

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