A reduce function takes a collection of key-value pairs with the same key value and summarizes them into a single result.

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This is the definition of a reduce function, which is commonly used in data processing and analysis. The key-value pairs with the same key value are combined using an operation specified by the user, such as summing up the values or finding the maximum value. The result is a single value that represents the summarized information.

A Reduce Function Takes a Collection of Key-Value Pairs with the Same