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We used cobalt oxide ( Co3O4 ) particles as an example , but these assays can be performed , in principle , regardless of the nanoparticle considered .
 Chemical: cobalt oxide; Chemical: Co3O4
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: cobalt oxide, Co3O4 
Answer:
 Chemical: cobalt oxide; Chemical: Co3O4