For those without close/reopen privileges, find posts with upvoted possible duplicate comments, then flag the question as a duplicate.
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select top 500 c.Text, c.Id as [Comment Link],
c.PostId as [Post Link],
c.CreationDate as [Creation Date]
from Comments c
where Text like '%Possible duplicate of%'
and c.Score >= 3
order by c.CreationDate DESC