C(23,9,2) = 10

Method of Construction: lex covering

Lower Bound: Bounds for fixed number of blocks

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