C(13,10,4) = 7

Method of Construction: lex covering

Lower Bound: Mills, Covering Designs I, 1979

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