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For six months in 1877 , he served with the 7th Cavalry in Montana in pursuit of hostile Sioux and Nez Perce Indians .
 organization: 7th Cavalry; location: Montana
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: 7th Cavalry, Montana 
Answer:
 organization: 7th Cavalry; location: Montana