Subsets
 Usage
• Subsets[list] gives a list of all possible subsets of list.
• Subsets[list, n] gives all subsets containing at most n elements.
• Subsets[list, {n}] gives all subsets containing exactly n elements.
• Subsets[list, { ,  }] gives all subsets containing between  and  elements.
• Subsets[list, nspec, s] gives the first s subsets.
• Subsets[list, nspec, {s}] gives the s subset.
Notes
• Subsets[list] gives the power set of list. • Subsets[list] orders subsets with shortest first, and later elements in list omitted first. • If the elements of list are in the order returned by Sort, then the complete result from Subsets[list] will also be in this order. • Subsets[list, All] is equivalent to Subsets[list]. • Subsets[list, { ,  , dn}] gives subsets containing  ,  + dn, ... elements. • Subsets[list, nspec, spec] gives the same result as Take[Subsets[list, nspec], spec]. • New in Version 5.1.
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