lower bound = 11

C(19,7,2) = 11

Method of Construction: lex covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4  5  6  7
  1  8  9 10 11 12 13
  1 14 15 16 17 18 19
  2  3  4  8  9 14 15
  2  3  4 10 11 16 17
  2  3  4 12 13 18 19
  5  6  7  8  9 16 17
  5  6  7 10 11 14 15
  5  6  7 12 13 18 19
  1  8  9 10 11 18 19
  1 12 13 14 15 16 17