An e-commerce site stores (user, product, rating) tuples for data analysis. E.g. tuple is ("user1", "product _x", 3), where rating is from 1-10 with 10 being the best. A user can rate many products and products can be rated by many users. Write MapReduce pseudo-code to find the range (min and max) of ratings received for each product. So each output record contains (, min rating> to ).