C(22,9,2) = 9

Method of Construction: mills, ars combinatoria, 8 (1979) pg. 247

Lower Bound: Bounds for fixed number of blocks

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