86584
Therefore , the most powerful man-made magnetic fields have been generated by " air-core " nonsuperconducting electromagnets of a design invented by Francis Bitter in 1933 , called Bitter electromagnets .
 person: Francis Bitter; 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: Francis Bitter, Bitter 
Answer:
 person: Francis Bitter; person: Bitter