C(42,20,2) = 7

Created by: LJCR

Method of Construction: Multiple of (21,10,2) covering

Lower Bound: Schonheim

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