lower bound = 13

C(22,7,2) = 13

Method of Construction: simulated annealing covering

Lower Bound: Schonheim

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