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# Runtime: 60 ms (Top 83.44%) | Memory: 13.8 MB (Top 70.65%)
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class Solution:
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    def subsetXORSum(self, nums: List[int]) -> int:
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        def sums(term, idx):
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            if idx == len(nums):
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                return term
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            return sums(term, idx + 1) + sums(term ^ nums[idx], idx + 1)
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        return sums(0, 0)