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Numbers (数, kazu) are the concept of the quantity or order of things.
Although there are various ways of counting numbers in different cultures, the decimal system is currently used around the world, in which numbers are counted in order from 1 to 10, and then turned around when the number reaches 10.
数とは (カズとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
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