Please provide a detailed explanation of the process of photosynthesis, including the role of chlorophyll, sunlight, water, and carbon dioxide. Your answer must contain a title, wrapped in double angular brackets, such as <<Understanding Photosynthesis>>. Include at least three highlighted sections in your answer with markdown, i.e., *highlighted section*. Your ENTIRE response should be in English, and in all lowercase letters. no capital letters are allowed.

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