C(23,12,2) = 6

Method of Construction: lex covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4  5  6  7  8  9 10 11 12
  1 13 14 15 16 17 18 19 20 21 22 23
  2  3  4  5  6  7 13 14 15 16 17 18
  2  3  4  5  6  7  8 19 20 21 22 23
  8  9 10 11 12 13 14 15 16 17 18 19
  1  2  3  4  9 10 11 12 20 21 22 23