Have a list of contacts who are not currently in a group.

I'm currently trying to sort my contacts into lists, but it's a bit tedious. If there was a way to only list people who are not currently in a list it would speed up the process of assigning remaining contacts into their respective groups (as well as making sure you didn't miss any for a group you already made). Shouldn't be too hard to code, and it would help a ton :).
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