how to delete repeated items completely

just started using zotero. its good. i like it i. i have entered my pdf files, but i dont know how to find repeated pdfs and delete them. i mean i have saved 100 pdf papers related to my research there are many pdf which are similar but the names are different. so how i can delete these repeated pdf to a single.
  • There is (currently) no way Zotero can know about any duplicated PDFs, so you will have to delete them manually.

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