How does paragraph 4 of "Fastest Car?" contribute to the section as a whole?

check your question

answer: they were written as a long tale

explanation:

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  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.

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