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After graduating from college in 1859 , Mitchell taught school until 1861 , when he joined the Union Army .
 person: Mitchell; organization: Union Army
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: Mitchell, Union Army 
Answer:
 person: Mitchell; organization: Union Army