lower bound = 6

C(12,6,2) = 6

Method of Construction: lex covering

Lower Bound: Schonheim

  1  2  3  4  5  6
  1  7  8  9 10 11
  2  3  4  7  8 12
  5  6  9 10 11 12
  2  3  4  9 10 11
  1  5  6  7  8 12