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useful properties of copper
state 1 useful property of copper
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1 useful property of copper
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what are the advantages of copper
the main benefits of copper
useful properties of copper, state 1 useful property of copper, useful property of copper, 1 useful property of copper, properties and applications of copper, properties of copper metal, properties and characteristics of copper, two properties of copper, what are the advantages of copper, the main benefits of copper
