C(28,8,2) = 17

Created by: Jan de Heer and Rade Belic

Lower Bound: Handbook of Combinatorial Designs section on coverings

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