lower bound = 10

C(10,7,4) = 10

Method of Construction: cyclic covering found by search program

Lower Bound: Schonheim

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