24 ≤ C(39,9,2) ≤ 26

Created by: LJCR

Method of Construction: Multiple of (13,3,2) covering

Lower Bound: Horsley, Theorem 1, r=5, d=2

  1  2  8 14 15 21 27 28 34
  1  3 12 14 16 25 27 29 38
  1  4  9 14 17 22 27 30 35
  1  5  6 14 18 19 27 31 32
  1  7 10 14 20 23 27 33 36
  1 11 13 14 24 26 27 37 39
  2  3  7 15 16 20 28 29 33
  2  4 13 15 17 26 28 30 39
  2  5 12 15 18 25 28 31 38
  2  6  9 15 19 22 28 32 35
  2 10 11 15 23 24 28 36 37
  3  4 11 16 17 24 29 30 37
  3  5 13 16 18 26 29 31 39
  3  6 10 16 19 23 29 32 36
  3  8  9 16 21 22 29 34 35
  4  5  7 17 18 20 30 31 33
  4  6  8 17 19 21 30 32 34
  4 10 12 17 23 25 30 36 38
  5  8 11 18 21 24 31 34 37
  5  9 10 18 22 23 31 35 36
  6  7 13 19 20 26 32 33 39
  6 11 12 19 24 25 32 37 38
  7  8 12 20 21 25 33 34 38
  7  9 11 20 22 24 33 35 37
  8 10 13 21 23 26 34 36 39
  9 12 13 22 25 26 35 38 39