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Colorado, Centennial State, CO | a state in west central United States in the Rocky Mountains | |
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conscientious objector, CO | one who refuses to serve in the armed forces on grounds of conscience | |
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cobalt, Co, atomic number 27 | a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition | |
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CO, carbon monoxide, carbon monoxide gas | an odorless very poisonous gas that is a product of incomplete combustion of carbon |