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class Solution:
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    def intersectionSizeTwo(self, intervals: List[List[int]]) -> int:
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        ans = []
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        for x, y in sorted(intervals, key=lambda x: (x[1], -x[0])):
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            if not ans or ans[-2] < x:
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                if ans and x <= ans[-1]:
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                    ans.append(y)
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                else:
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                    ans.extend([y - 1, y])
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        return len(ans)