che online playground: tice that two duplicate data regard as two data. an example, for location 'Fallowfield', you may count 2 for below tw _id" : 3, "address" : "317 Wilmslow Road", "location" : "Fallowfield", id" : 4, "address" : "317 Wilmslow Road", "location" : "Fallowfield", "nai "nar a. Write a query using a map-reduce pipeline to get the count of re each location. b. Write a query to get the average rating for each location withou

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