Board Thread:Support Requests - Getting Technical/@comment-25657959-20200902002814

It appears that I misused the MassCategorization script a while ago by replacing redundant categories with the category I wanted to keep, but I didn't realize that it would still add that category if the pages already had my chosen category (eg: has Pokemon: Steel and Pokemon: Dragon twice). Is there any easy way to fix this? The only thing I can think of right now is to have MassEdit remove the 2nd and 3rd instances of the chosen category from all of its pages, but I would have to do manually select categories that I suspect have that problem and run MassEdit multiple times (something I don't want to do). 