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Because there are only a limited amount of ways that we need to get information from a computer but a wide variety of ways are needed to get data into a computer because of the amount of things they are used for. Output is generally in the form of visuals, print, sounds and things like robotic movement. That covers the majority of our needs. For input there are many ways we want to get information in, and new ones are being invented all the time, so there are many more of them.

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