[question] Find items without PDFs?

I created a search as follows:

item type is journal article
attachment file time is NOT PDF

The problem is that if an item has two attachments and one of them is not a PDF, it also shows up. Is there some way to exclude such results from my search? I only want to show items that don't have a PDF, not items that have non-PDF attachments along with a PDF.

Thanks.
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