Perfect shuffle: Difference between revisions
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=={{header|Mathematica}}/{{header|Wolfram Language}}==
<lang Mathematica>shuffle[deck_] := Apply[Riffle, TakeDrop[deck, Length[deck]/2]];
shuffleCount[n_] := Block[{count=0}, NestWhile[shuffle, shuffle[Range[n]], (count++; OrderedQ[#] )&];count];
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