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The computational results indicate that SWNTs can activate and guide the self - assembly of polymer chains , allowing them to adopt a helical configuration in a SWNT through the combined action of the van der Waals potential well and the pi - pi stacking interaction between the polymer and the inner surface of SWNTs .
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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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