Adding a prefix to all Revit room numbers in a project

We have some duplicates. Probably have to delete those?

rename would suffice

I went and deleted all the duplicate rooms but it is still not responding when I run the process.

can you add the prefix parameter in this schedule?

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Thanks for the help @Marcel_Rijsmus. I will have to try restarting computer again and try over and let it go for a hour or so maybe. I might just try trial and error with smaller projects as well