C(28,16,2) = 5

Method of Construction: lexicographic greedy covering

Lower Bound: Bounds for fixed number of blocks

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