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Natural number (自然数, shizensū) is a number used to express the number of pieces or the order of pieces.
There are two ways of thinking about it: one is to not include zeros, as in "1, 2, 3, 4......", and the other is to include zeros, as in "0, 1, 2, 3, 4......".
自然数とは (シゼンスウとは) [単語記事] - ニコニコ大百科 (NicoNico Encyclopedia)
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