C(28,18,2) = 4

Created by: LJCR

Method of Construction: Multiple of (14,9,2) covering

Lower Bound: Schonheim

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