C(13,5,2) = 10

Method of Construction: lex covering

Lower Bound: Schonheim

  1  2  3  4  5
  1  6  7  8  9
  1 10 11 12 13
  2  3  6  7 10
  2  3  8  9 11
  4  5  6  7 11
  4  5  8  9 10
  2  3  4 12 13
  5  6  7 12 13
  1  8  9 12 13