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Thanks for answering. Let me explain. I downloaded almost 1000 epub my trusted site. I added to an empty temporary library, and after I updated some data, I proceeded to move them to the main library. At that time Calibre detect duplicates. So I spent all duplicate to another library. The fact is that duplicates are not always such, because they are usually different translations or different editions. For that reason i want compare not only locate duplicate.
I hope I explained better now.
thanks for your support
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