What is the method to maintain the encoding of string literals across diverse systems?

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The most reliable method to maintain the encoding of string literals across diverse systems is to use Unicode encoding. Unicode is a standard encoding system that includes all characters and symbols from all languages, scripts, and symbol sets. This ensures that string literals are encoded consistently across different systems, regardless of language or platform. Additionally, specifying the encoding in the documentation or code comments can also help ensure consistent encoding across diverse systems.