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# [[Woodblock printing]]
# [[Paper]]<!-- 405 --><ref name=who>{{cite web|title=Who Built it First |work=Ancient Discoveries |publisher=A&E Television Networks |year=2008 |url=http://www.history.com/minisite.do?content_type=Minisite_Generic&display_order=5&content_type_id=60600&mini_id=52979 |access-date=2009-04-03 |archive-url=https://web.archive.org/web/20090429202316/http://www.history.com/minisite.do?content_type=Minisite_Generic&display_order=5&content_type_id=60600&mini_id=52979 |archive-date=2009-04-29 |url-status=live }}</ref>
#[[Quipu]]
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# [[Algebra]]
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