C(20,14,3) = 6

Method of Construction: simple construction: multiple of smaller covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4  5  6  7 11 12 13 14 15 16 17
  1  2  3  4  8  9 10 11 12 13 14 18 19 20
  1  5  6  7  8  9 10 11 15 16 17 18 19 20
  2  3  4  5  6  8  9 12 13 14 15 16 18 19
  2  3  4  5  6  7 10 12 13 14 15 16 17 20
  1  2  3  4  7  8  9 11 12 13 14 17 18 19