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When duplicates are found in the input lists, log them to stderr. For the case of duplicates across list, we print the whole list, sorted, rather than three separate lists, as it makes it simpler to spot the duplicate, at which point the file will be easy to spot in either `create_ios_framework.py` or `create_macos_framework.py`. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style