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LSE (Large Scale Engineering) is an internal domain-specific programming language developed by Google. It's used to manage and maintain the company's large software systems at scale, including services like search and Gmail. LSE is intended to support clear, maintainable code that can handle complex interactions between different components. The language features static verification tools that help engineers catch errors early in the development cycle and work with massive codebases in a sustainable way over time. LSE also supports efficient refactoring operations across multi-million line repositories, making it easier for teams at Google to keep their systems up-to-date with changing requirements without sacrificing stability or performance.