Your response should contain at least 4 sentences. The response must have 2 sections. Mark the beginning of each section with SECTION 1 and SECTION 2. Your answer must contain a title, wrapped in double angular brackets, such as <<Understanding the Basics>>. Include keywords [constraints, sections, sentences, response] in the response. At the end of your response, please explicitly add a postscript starting with P.P.S.

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