when was liu wei di huang wan created the first system

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when was liu wei di huang wan created the first system of writing	zhi bai di huang wan
when was liu wei di huang wan created the first system of measurement	when was liu wei di huang wan created the first system of units
when was liu wei di huang wan created the first system of computer	when was liu wei di huang wan created the first system of medicine
when was liu wei di huang wan created the first system of government	when was liu wei di huang wan created the first system of classification