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The fibers have a strict " brick and mortar " layered structure , with graphene sheet as rigid brick and PVA as soft mortar .
 Chemical: graphene; Chemical: PVA
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: PVA