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There is no sign of fracture or plastic deformation in the case of diamond - like carbon ; wear could be characterized as a gradual atom - by - atom process .
 Chemical: diamond; Chemical: carbon
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: diamond; Chemical: carbon