Your entire response should be in English, and in all lowercase letters. no capital letters are allowed. your response should contain at least 100 words. the response must contain at least 3 placeholders represented by square brackets, such as [address]. your answer must contain a title, wrapped in double angular brackets, such as <<how to send a letter>>. in your response, the letter 'a' should appear at least 20 times. in your response, the word 'letter' should appear at least 5 times. there should be 3 paragraphs. paragraphs are separated with the markdown divider: ***
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