90\. Subsets II

Medium

Given an integer array `nums` that may contain duplicates, return _all possible subsets (the power set)_.

The solution set **must not** contain duplicate subsets. Return the solution in **any order**.

**Example 1:**

**Input:** nums = [1,2,2]

**Output:** [[],[1],[1,2],[1,2,2],[2],[2,2]] 

**Example 2:**

**Input:** nums = [0]

**Output:** [[],[0]] 

**Constraints:**

*   `1 <= nums.length <= 10`
*   `-10 <= nums[i] <= 10`