C(23,15,2) = 4

Method of Construction: lex covering

Lower Bound: Schonheim

  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
  1  2  3  4  5  6  7 16 17 18 19 20 21 22 23
  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22
  1  2  3  4  5  6  8  9 10 11 12 13 14 15 23