C(60,20,2) = 12

Created by: LJCR

Method of Construction: Multiple of (12,4,2) covering

Lower Bound: Schonheim

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