Count Special Quadruplets LeetCode solution in Python

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# Runtime: 640 ms (Top 64.4%) | Memory: 17.10 MB (Top 9.2%)
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class Solution:
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    def countQuadruplets(self, nums: List[int]) -> int:
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        return sum([1 for a, b, c, d in combinations(nums, 4) if a + b + c == d])