ANSWERS: 3
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I have a feeling you're on one of those crazy question websites right now.
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Maybe because the computer or typewriter is upright, while the paper would be lying down?
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A typewriter (yes, old technology) used to scroll paper upwards after finishing a line of text. I'd take an educated guess that that is the reason for the request to "type something up". It logically follows that when you write something, it's written *down* on a piece of paper... :)
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