Your answer must contain a title, wrapped in double angular brackets, such as <<poem of joy>>. Your response should contain at least 4 sentences. The response must include a postscript starting with "P.S." and must contain at least 2 placeholders represented by square brackets, such as [address]. Include keywords [birthday, celebration, guests, cake] in the response. In your response, the word "celebrate" should appear at least 2 times.
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