250145
Since this distance is on the order of the pitch of the chiral nematic liquid crystal ( typically 100 nm ) and since the geometries of usual liquid crystal samples are much larger , the double twist structure occurs only rarely .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
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