C(27,21,2) = 3

Created by: LJCR

Method of Construction: Multiple of (9,7,2) covering

Lower Bound: Schonheim

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