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The use of glassy carbon electrodes ( GCEs ) modified with multi - walled carbon nanotube ( CNT ) films for the continuous monitoring of polyphenols in flow systems has been examined .
 Chemical: carbon; Chemical: carbon; Chemical: polyphenols
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: carbon; Chemical: carbon; Chemical: polyphenols