C(24,12,2) = 6

Method of Construction: lex covering

Lower Bound: Schonheim

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  2  3  4  5  6  7 13 14 15 16 17 24
  8  9 10 11 12 18 19 20 21 22 23 24
  2  3  4  5  6  7 18 19 20 21 22 23
  1  8  9 10 11 12 13 14 15 16 17 24