C(22,13,2) = 5

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