C(25,13,2) = 6

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