13442
The GIPAW method , via verification using NMR measurements , was shown to be capable of the fine refinement of the crystal structures of polymers when coarse X - ray diffraction data for powdered samples are available .
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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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