The power set of some set S, denoted 
, is the set of all subsets of S (including S itself). NB: The empty set is a subset of all sets.Examples:
1.
Input: 0,1
Output:{{},{0},{1},{0,1}}
2.
Input: i,love,you
Output: {null},{i},{love},{i,love},{you},{i,you},{love,you},{i,love,you}
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