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which culture used incas number counting system and when?

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which culture used incas number counting system and when?
how it works?
what do they count with?
how was it discovered?
is this method still used now?
那个文明体系使用印加计数法,什么时候使用的?
怎么运用?
他们用来算什么?
怎么发现它的?
这种方法现在还用吗?
再问: thanks,but i want the anwers.
再答: ?