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Our results indicate that nitrogen configuration and its location ( armchair or zigzag edge ) in nitrogen - doped graphene can be identified via the spectral analysis .
 Chemical: nitrogen; Chemical: nitrogen - doped 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: nitrogen; Chemical: nitrogen - doped graphene