Deleting duplicate forms

I have accidentally ended up with duplicate forms, I think because my connection crashed whilst importing a directory of PDF files and I just reloaded. I can get a list of duplicates (pasted below), but can't see an easy way to delete them. Or does this not matter? E.g. do they only go through verification once and only get including in the output once?

Thanks

Mark

Questionnaire Formid PFID
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