lower bound = 26

C(17,4,2) = 26

Method of Construction: colex greedy covering

Lower Bound: Schonheim

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