C(20,8,2) = 9

Created by: LJCR

Method of Construction: Multiple of (10,4,2) covering

Lower Bound: Bounds for fixed number of blocks

  1  2  3  4 11 12 13 14
  1  5  6  7 11 15 16 17
  1  8  9 10 11 18 19 20
  2  3  5  8 12 13 15 18
  2  3  6  9 12 13 16 19
  2  3  7 10 12 13 17 20
  4  5  6 10 14 15 16 20
  4  7  8  9 14 17 18 19
  5  6  8  9 15 16 18 19