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users: 1 6 books: 9 check
users: 2 0 books: 7 check
categories: Science
users: 2 0 books: 138 check
users: 2 0 books: 120 check
users: 2 0 books: 107 check
users: 3 0 books: 91 check
users: 3 3 books: 83 check
users: 3 8 books: 116 check
users: 3 33 books: 102 check
users: 0 0 books: 122 check
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