C(60,21,2) = 12

Created by: LJCR

Method of Construction: Multiple of (20,7,2) covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4  5  6  7 21 22 23 24 25 26 27 41 42 43 44 45 46 47
  1  5 12 13 14 15 20 21 25 32 33 34 35 40 41 45 52 53 54 55 60
  1  8  9 10 11 12 13 21 28 29 30 31 32 33 41 48 49 50 51 52 53
  1 14 15 16 17 18 19 21 34 35 36 37 38 39 41 54 55 56 57 58 59
  2  3  4 10 11 18 19 22 23 24 30 31 38 39 42 43 44 50 51 58 59
  2  3  4 12 13 16 17 22 23 24 32 33 36 37 42 43 44 52 53 56 57
  2  3  8  9 14 15 20 22 23 28 29 34 35 40 42 43 48 49 54 55 60
  4  5 10 11 16 17 20 24 25 30 31 36 37 40 44 45 50 51 56 57 60
  4  6  7  8  9 16 17 24 26 27 28 29 36 37 44 46 47 48 49 56 57
  4  6  7 10 11 14 15 24 26 27 30 31 34 35 44 46 47 50 51 54 55
  5  8  9 12 14 18 19 25 28 29 32 34 38 39 45 48 49 52 54 58 59
  6  7 12 13 18 19 20 26 27 32 33 38 39 40 46 47 52 53 58 59 60