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How is the relationship between page and page number defined in the book for #15? Is it defined by the page numbers of the book (i.e. the page numbered 1 is page 1, the page numbered 2 is page 2, and so on), is it defined by the front and back of a piece of paper (e.g. page 1 contains page number 1 on the front and page number 2 on the back), or is it defined by folding all of the pages horizontally and nesting them inside of each other (e.g. page 1 contains the first two and final two page numbers)?
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