Provide a detailed description of a futuristic city, including its major features and how it operates. Your response should contain at least 150 words and include a title, wrapped in double angular brackets, such as <<the city of tomorrow>>. Highlight at least 3 sections in your answer with markdown, i.e. *highlighted section*. At the end of your response, please explicitly add a postscript starting with *P.P.S*.
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