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Two - dimensional ( 2D ) atomic crystals , such as graphene and transition - metal dichalcogenides , have emerged as a new class of materials with remarkable physical properties .
 Chemical: graphene; Chemical: transition - metal dichalcogenides
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: transition - metal dichalcogenides