How do I find what modules are using a category so I can remove it from the category list?

How do I find what modules are using a category so I can remove it from the category list?

How do I find what modules are using a category so I can remove it from the category list?
 
I have marked them for deletion, but I want them removed. How do I find out what modules are using the categories so I can clean up that list?
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