C(10,4,2) = 9

Method of Construction: lex covering

Lower Bound: Bounds for fixed number of blocks

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