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The ozone - oxidized graphene is not removed but is gradually transformed to graphene oxide ( GO ) .
 Chemical: ozone; Chemical: oxidized graphene; Chemical: graphene oxide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ozone; Chemical: oxidized graphene; Chemical: graphene oxide