18166
The proposed mechanism of simultaneously high strength , modulus , and toughness challenges the prevailing 50 year old paradigm of high - performance polymer fiber development calling for high polymer crystallinity and may have broad implications in fiber science and technology .
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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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