C(27,18,3) = 7

Created by: LJCR

Method of Construction: Multiple of (9,6,3) covering

Lower Bound: Mills, Covering designs I, 1979

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