C(26,12,2) = 7

Created by: LJCR

Method of Construction: Multiple of (13,6,2) covering

Lower Bound: Schonheim

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