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This allows for the battery to operate through the one - electron redox process of O ( 2 ) / O ( 2 ) ( - ) .
 Chemical: O ( 2 ); Chemical: O ( 2 ) ( - )
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: O ( 2 ); Chemical: O ( 2 ) ( - )