20333
In addition , graphene deposited on mica , when folded , preserved the same corrugation level as before the folding event .
 Chemical: graphene; Chemical: mica
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: mica