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2. READIT is a vendor of ebooks. They provide recommendations to customers based on ratings by other customers. Each customer rates each book that they

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2. READIT is a vendor of ebooks. They provide recommendations to customers based on ratings by other customers. Each customer rates each book that they read, by giving a star rating from 1 star to 5 stars (there are no \"half\" stars). Suppose READIT wants to recommend books to a customer called Wendy. For each customer X other than Wendy, they rst calculate ifn

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