http://en.wikipedia.org/wiki/Abacus (5 years and 2746 days ago)
abacus - created by lincemiope
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Oh! Now you're back in time ...
not believe.
I miss from China for 10 years, but all used the 'schedule, and I had also learned how to make simple calculations
the binary system is very convenient, and is the basis of computing
thnak for the comment
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