Print Permutations of an array with duplicate elements

Given an array with duplicate elements. Print all the unique permutations of elements of the array. In part-1 of this problem we discussed the solution where there are no duplicates in the array.

Part-1:    • Print Permutations of elements of an array...  

Covers Following Leetcode Problems:
46. https://leetcode.com/problems/permuta...
47. https://leetcode.com/problems/permuta...
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