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The candidate's solution is correct and solves the problem. The approach is to use a recursive function that takes in a list of integers and a list of lists. The function will iterate through the list of integers and add each integer to the list of lists. Then it will call itself with the list of integers minus the current integer and the list of lists. This will continue until the list of integers is empty. The function will then return the list of lists. This solution is optimal because it is O(2^n) time complexity and O(n) space complexity.