I need to write a letter to a friend who is moving to a new city. Can you help me craft a heartfelt message? The letter should include [address] as the friend's new address. The response must contain exactly 4 paragraphs separated with the markdown divider: ***. There should be at least 2 highlighted sections in your answer with markdown, i.e., *highlighted section*. The response must contain at least 2 placeholders represented by square brackets, such as [address]. The letter should conclude with a postscript starting with P.S.

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