IF formula for Days Past Due

New wrinkle to a previous issue. I now need to add more exclusion text to a formula. I want to show days past due if the text in the cell is NOT "Complete", "Excluded", or "Deferred". This is my current formula: =IF(Status7 <> "Complete", IF(TODAY() - [Due Date]7 >= 0, TODAY() - [Due Date]7)). How do I add the terms "Excluded" and "Deferred" after "Completed"? I tried to use the OR syntax but couldn't get it to work correctly.

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