Your response should contain at least 3 sentences. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. In your response, the word *example* should appear at least 3 times. Include keywords *example, solution, and explanation* in the response. Your entire response should be in English, and in all lowercase letters. no capital letters are allowed. your answer must contain a title, wrapped in double angular brackets, such as <<poem of joy>>. at the end of your response, please explicitly add a postscript starting with [postscript] [postscript] is p.s.
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