C(12,9,5) = 12

Method of Construction: cyclic covering found by search program

Lower Bound: Schonheim

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