C(50,20,2) = 9

Created by: LJCR

Method of Construction: Multiple of (10,4,2) covering

Lower Bound: Schonheim

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