"Find redundant items" function

I'm not sure whether somebody else has already proposed the same thing, but I would like to request a function to "find redundant items". Basically, with ID number for each literature, such as PMID or DOI, you could easily search redundant items in your library.

It is quite likely to get the same literature many times without notice. So I think this function is necessary when you want to manage a large number of papers.

How do you think?
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