lower bound = 18

C(14,4,2) = 18

Method of Construction: lex covering

Lower Bound: Schonheim

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