C(31,14,2) = 7

Method of Construction: simple construction: deleted element from c(v+1,k,t) covering

Lower Bound: Schonheim

  1  2  3  4  5  6  7  8  9 14 15 16 17 18
  6  7  8  9 10 11 12 13 19 20 21 22 23 24
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  9 14 15 16 17 18 19 20 21 22 28 29 30 31
  1  2  3  4  5 19 20 21 22 23 24 25 26 27
  2  6  7  8  9 23 24 25 26 27 28 29 30 31
  1  2  3  4  5 10 11 12 13 17 28 29 30 31