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I’ve recently stumbled across a tool that detects duplicate code (aka code clones) called CCFinder. It’s definitely not the simplest thing in the world to download and install, and it’s a little bit painful to exclude generated files (it has to be done manually) but it does do make finding repeated code a lot easier than with a tool like Simian. Why? Because you get a visual indication of where the duplicates are and can see the code itself. Plus you have greater control over the rules used to detect duplication of code.