C(22,16,4) = 9

Method of Construction: simple construction: multiple of smaller covering

Lower Bound: Todorov, JCTA, 1985

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