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@Starson17 - I was going to suggest that but it would still only be a subset of what he wants.
What he wants to do is find duplicate pairs that he can immediately merge without thinking. So a book that has PDF and a book that has EPUB can be merged.
However two books which both have EPUB cannot be merged without figuring out which wins. So the formats:#1 would not work for him in this situation
Also it would not catch say a book with RTF, PDF and a book with EPUB - these can be safely merged as well, even though the count of their formats differ.
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