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The key step to fabricate the longitudinal and crosssectional views of the mesofibers shown here is a concerted block - copolymer synthesis , microphase separation , and cross linking at 140 degrees C followed by pyrolysis at 1100 degrees C .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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