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In addition , Co ( II ) ( Ch ) is more stable than Co ( II ) ( OEP ) , where the catalytic turnover number ( TON ) of the two - electron reduction of O ( 2 ) catalyzed by Co ( II ) ( Ch ) exceeded 30000 .
 Chemical: Co ( II ) ( Ch ); Chemical: Co ( II ) ( OEP ); Chemical: O ( 2 ); Chemical: Co ( II ) ( Ch )
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: Co ( II ) ( Ch ); Chemical: Co ( II ) ( OEP ); Chemical: O ( 2 ); Chemical: Co ( II ) ( Ch )