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SUBMIT YOUR IDEAIf I'm honest I didn't really understand the problem so used it as a learning opportunity and followed along to @PhilipMannering solution.
Great Anonymisation Challenge. Spent time trying to dynamically change field types based on a lookup (nice to use a crew macro here). Spent time considering numeric vs non numeric (could extend this of course). I've got a lookup to unscramble the data if needed.
Time Taken: 30:29