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Density functional theory predicts gaps in covalently functionalized graphene as high as 2 eV , while this approach neglects the fact that lattice symmetry breaking occurs over only a prescribed radius of nanometer dimension , which we label the S - region .
 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