What is the significance of the red poppy in relation to Remembrance Day, and how is it used in different countries? Your response should contain at least 3 paragraphs. Paragraphs are separated with the markdown divider: ***. In your response, the word "poppy" should appear at least 5 times. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. At the end of your response, please explicitly add a postscript starting with P.S.

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