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By combining ion beam experiments and atomistic simulations we study the production of defects in graphene on Ir ( 111 ) under grazing incidence of low energy Xe ions .
 Chemical: graphene; Chemical: Ir ( 111 ); Chemical: Xe
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: Ir ( 111 ); Chemical: Xe