C(20,16,3) = 4

Method of Construction: lexicographic greedy covering

Lower Bound: Schonheim

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