These can be used to create Select list Column dropdown menus where each item can only be selected one time per column.
Select list (single)
Selectable options (single)
Select list (multi)
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Very cool post! A lot of use cases came to mind after seeing this. I’ll be bookmarking it for future projects. 
Thank you for posting and for the great screenshots and walkthrough!
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For some reason this formula doesn’t work((