C(55,21,2) = 10

Created by: Jan de Heer and Steve Muir

Method of Construction: Private tools

Lower Bound: Bounds for fixed number of blocks

  1  2  5 10 13 14 15 19 21 22 23 24 26 33 37 40 43 46 47 51 55
  1  3  4  5  6  7  8  9 10 11 14 20 21 24 30 37 38 39 47 50 53
  1  4  6 12 14 16 25 27 30 31 32 34 35 36 37 39 43 48 49 52 54
  1  5  8 10 14 17 18 21 24 27 28 29 31 35 37 41 42 44 45 47 49
  2  3 11 13 15 18 20 22 23 26 27 28 29 31 35 42 43 49 50 51 55
  2  4  6  7  9 13 15 17 22 23 26 30 38 39 41 43 44 45 51 53 55
  2  5  7  8  9 10 12 13 16 22 25 28 32 34 36 42 48 51 52 53 54
  3 11 12 16 17 19 20 25 32 33 34 36 40 41 44 45 46 48 50 52 54
  4  6  7  8  9 18 19 27 28 29 30 31 33 35 38 39 40 42 46 49 53
  8 12 15 16 18 21 23 24 25 26 29 32 34 36 38 43 47 48 52 54 55