C(28,14,2) = 6

Method of Construction: lexicographic greedy covering

Lower Bound: Schonheim

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