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Graphene sheets : gram - scale synthesis of graphene sheets by a catalytic arc - discharge method ( small 8 / 2013 ) .
 Chemical: Graphene; Chemical: graphene
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: Graphene; Chemical: graphene