C(57,21,2) = 11

Created by: LJCR

Method of Construction: Multiple of (19,7,2) covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4  5  6  7 20 21 22 23 24 25 26 39 40 41 42 43 44 45
  1  8  9 10 11 12 13 20 27 28 29 30 31 32 39 46 47 48 49 50 51
  1  8  9 10 11 18 19 20 27 28 29 30 37 38 39 46 47 48 49 56 57
  1 12 13 14 15 16 17 20 31 32 33 34 35 36 39 50 51 52 53 54 55
  1 14 15 16 17 18 19 20 33 34 35 36 37 38 39 52 53 54 55 56 57
  2  3  4  8  9 14 15 21 22 23 27 28 33 34 40 41 42 46 47 52 53
  2  3  4 10 11 16 17 21 22 23 29 30 35 36 40 41 42 48 49 54 55
  2  3  4 12 13 18 19 21 22 23 31 32 37 38 40 41 42 50 51 56 57
  5  6  7  8  9 16 17 24 25 26 27 28 35 36 43 44 45 46 47 54 55
  5  6  7 10 11 14 15 24 25 26 29 30 33 34 43 44 45 48 49 52 53
  5  6  7 12 13 18 19 24 25 26 31 32 37 38 43 44 45 50 51 56 57