What are the various input and output types supported by MapReduce?

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    Mapreduce framework provides a user with many different output and input types.
    Ex. Each line is a key/value pair. The key is the offset of the line from the beginning of the file and the value are contents of the line. It is up-to the will of the user. Also a user can add functionality at his will to support new input and output types.

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