C(30,23,4) = 7

Created by: LJCR

Method of Construction: Simple construction from (29,22,4)

Lower Bound: Mills, Covering Designs I, 1979

  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 30
  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 17 18 20 22 23 24 25 30
  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 17 18 22 26 27 28 29 30
  1  2  3  4  5  6  8  9 10 11 15 16 19 20 21 23 24 25 26 27 28 29 30
  1  3  7  8 10 12 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
  2  4  5  7 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
  3  6  7  9 11 12 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30