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There are three kinds of books in the school library: popular science books, story books and comic books. Each student can borrow two books from them, so at least _ _ _ students can borrow them.
According to three situations (popular science books, story books), (popular science books, comic books) and (story books, comic books), three drawers are constructed.

3+ 1=4 (pieces),

Answer: At least four students must borrow books, ensuring that two of them must borrow books of the same category.

So the answer is: 4.

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