lower bound = 16

C(9,7,6) = 16

Method of Construction: lex covering

Lower Bound: Schonheim

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