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cu + o2 + h2so4
cu2o + h2so4
cuso4 + h2o
cu+2h2so4
cu+h2so4+o2
cuo+h2so4 cuso4+h2o
cuso4+h2o2
cu+h2so4+h2o2
cu+h2o2+h2so4
h2o2+cuso4
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