What are the key elements of a successful marketing campaign? Your response should contain at least 3 placeholders represented by square brackets, such as [address]. Your answer must contain exactly 3 bullet points. Use the markdown bullet points such as: * This is point 1. 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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