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class Solution:
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    def numPairsDivisibleBy60(self, time: List[int]) -> int:
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        res, count = 0, [0] * 60
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        for one in range(len(time)):
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            index = time[one] % 60
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            res += count[(60 - index) % 60]  # %60 is for index==0
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            count[index] += 1
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        return res