29656
How Graphene Slides : Measurement and Theory of Strain - Dependent Frictional Forces between Graphene and SiO2 .
 Chemical: Graphene; Chemical: Graphene; Chemical: SiO2
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Graphene, Graphene, SiO2 
Answer:
 Chemical: Graphene; Chemical: Graphene; Chemical: SiO2