18 ≤ C(52,14,2) ≤ 19

Created by: LJCR

Method of Construction: Multiple of (26,7,2) covering

Lower Bound: Schonheim

  1  2  3  4  5  6 15 27 28 29 30 31 32 41
  1  2  7  8 16 17 18 27 28 33 34 42 43 44
  1  2  9 10 18 19 20 27 28 35 36 44 45 46
  1  2 11 12 21 22 23 27 28 37 38 47 48 49
  1  2 13 14 24 25 26 27 28 39 40 50 51 52
  3  4  7 12 18 21 25 29 30 33 38 44 47 51
  3  4  8 11 14 19 20 29 30 34 37 40 45 46
  3  4  9 17 20 24 26 29 30 35 43 46 50 52
  3  4 10 13 16 22 23 29 30 36 39 42 48 49
  5  6  7 10 14 23 25 31 32 33 36 40 49 51
  5  6  8  9 20 22 25 31 32 34 35 46 48 51
  5  6 11 16 18 24 26 31 32 37 42 44 50 52
  5  6 12 13 17 19 21 31 32 38 39 43 45 47
  7  9 11 13 15 20 23 33 35 37 39 41 46 49
  7 17 19 22 23 24 26 33 43 45 48 49 50 52
  8 10 12 15 21 24 26 34 36 38 41 47 50 52
  8 13 14 15 18 22 23 34 39 40 41 44 48 49
  9 12 14 16 17 20 21 35 38 40 42 43 46 47
 10 11 15 16 17 19 25 36 37 41 42 43 45 51