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Mathematica

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    $\begingroup$ Can there be multiple simple elements? And if there are duplicate elements overall and selection/permutation results in a duplicate permutation, is it to remain or do you require distinctness? You need to better specify the question... $\endgroup$ Commented Aug 19, 2015 at 11:04
  • $\begingroup$ Yes, there can be any number of simple elements and simple lists. There can be no duplicate elements. $\endgroup$ Commented Aug 19, 2015 at 11:14