lower bound = 6

C(8,7,5) = 6

Method of Construction: lex covering

Lower Bound: Schonheim

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