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Ellis was the first person appointed as leader of all the Nez Perce , at the urging of Elijah White , the U.S. Indian agent for the Oregon Country in 1842 .
 Ellis, Elijah White
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ellis, Elijah White