C(27,15,2) = 5

Created by: LJCR

Method of Construction: Multiple of (9,5,2) covering

Lower Bound: Bounds for fixed number of blocks

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