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Here , we prepared sandwich - like building blocks of poly ( vinyl alcohol ) ( PVA ) - coated graphene , and achieved high - nanofiller - content kilometers - long fibers by continuous wet - spinning assembly technology .
 Chemical: poly ( vinyl alcohol ); Chemical: PVA; Chemical: 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: poly ( vinyl alcohol ); Chemical: PVA; Chemical: graphene