C(55,20,2) = 11

Created by: LJCR

Method of Construction: Multiple of (11,4,2) covering

Lower Bound: Bounds for fixed number of blocks

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