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In Dakota , the 8th Cavalry relieved the 7th Cavalry and eventually went on to fight in the Ghost Dance War against Chief Sitting Bull .
 8th Cavalry, 7th Cavalry, Sitting Bull
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 8th Cavalry, 7th Cavalry, Sitting Bull