C(28,9,2) = 14

Method of Construction: simple construction: deleted element from c(v+1,k,t) covering

Lower Bound: Greig Li and van Rees; 2004

  2  3 15 17 19 22 24 25 27
  4  5  7  8 11 13 17 21 25
  1  5  7 12 14 18 21 24 28
  4  5  9 10 13 16 22 26 27
  1  9 11 12 17 20 25 26 28
  2  3  8  9 11 14 18 24 26
  1  8 10 11 12 15 16 19 24
  5  6  7  9 15 19 21 23 26
  2  3  5  7 10 16 20 21 28
  1  7 12 14 19 21 22 27 28
  1  2  3  4  6 12 13 15 23
  6 10 14 16 17 18 23 24 25
  4 13 14 15 18 19 20 24 28
  6  8 11 18 20 22 23 27 28