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It looks like you're using a substitution cipher, specifically a letter substitution where each letter is replaced by a different letter a fixed number of positions down the alphabet.
However, I'm guessing that might not be the intended message. rabt thmyl bwt fry fayr
If I decode the message "rabt thmyl bwt fry fayr" using a simple Caesar cipher, I get: It looks like you're using a substitution cipher,