lower bound = 17

C(10,3,2) = 17

Method of Construction: simple construction: combined (9,3,2) and (9,2,1)-coverings

Lower Bound: Schonheim

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