Question

Write a function that generates all subsets of given set?
function solve( a ){ //write your code here }
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Input: [1, 2, 3]
Output: [[1], [2], [3], [1, 2], [1, 3], [2, 3], [1, 2, 3], []]
Reason: There are 8 subsets of the given set [1, 2, 3]