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The library numbers the newly bought books from 0 to 85. Do you know how many books Xinbei bought?
86 books.

Because he started from the full serial number, the serial number from 0 to 85 * * * is 86, so he bought 86 books when he bought them, and Xinbeier got 86 new books.

The books in the library are arranged in order, so there are also books arranged by the first letter of the title.