Subsets II

Given a collection of integers that might contain duplicates,nums, return all possible subsets (the power set).

Note:The solution set must not contain duplicate subsets.

For example,
Ifnums=[1,2,2], a solution is:

[
  [2],
  [1],
  [1,2,2],
  [2,2],
  [1,2],
  []
]

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