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class Solution:
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    def sumOfUnique(self, nums: List[int]) -> int:
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        hashmap = {}
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        for i in nums:
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            if i in hashmap.keys():
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                hashmap[i] += 1
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            else:
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                hashmap[i] = 1
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        sum = 0
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        for k, v in hashmap.items():
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            if v == 1:
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                sum += k
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        return sum