C(40,20,2) = 6

Created by: LJCR

Method of Construction: Multiple of (20,10,2) covering

Lower Bound: Schonheim

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