lower bound = 6

C(13,7,2) = 6

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