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Cao Cao has written:
'Cao Cao shi wen xuan'
Cao-Cao was born in 1973.
Cao Cao died when he was sixty years old.
Cao Cao's invasion of Xu Province happened in 193.
The Chemical formula for lime is CaO. This comes from Limestone (CaCO3). As Limestone is heated up to 1000 degrees, it lets of Carbon Dioxide and becomes CaO, or quicklime.