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In the Bitter design , below , used in very high field research magnets , the windings are constructed as flat disks to resist the radial forces , and clamped in an axial direction to resist the axial ones .
 person: Bitter
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: Bitter 
Answer:
 person: Bitter