lower bound = 25

C(9,4,3) = 25

Method of Construction: lex covering

Lower Bound: Schonheim

  1  2  3  4
  1  2  5  6
  1  2  7  8
  1  3  5  7
  1  3  6  8
  1  4  5  8
  1  4  6  7
  2  3  5  8
  2  3  6  7
  2  4  5  7
  2  4  6  8
  3  4  5  6
  3  4  7  8
  5  6  7  8
  1  2  3  9
  1  4  5  9
  1  6  7  9
  2  4  6  9
  2  5  7  9
  3  4  7  9
  3  5  6  9
  1  2  8  9
  3  4  8  9
  5  6  8  9
  1  7  8  9