lower bound = 7

C(14,6,2) = 7

Method of Construction: simple construction: multiple of smaller covering

Lower Bound: Schonheim

  1  2  3  8  9 10
  1  4  5  8 11 12
  1  6  7  8 13 14
  2  4  6  9 11 13
  2  5  7  9 12 14
  3  4  7 10 11 14
  3  5  6 10 12 13