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Robert Cumming Schenck ( October 4 , 1809 – March 23 , 1890 ) was a Union Army general in the American Civil War , and American diplomatic representative to Brazil and the United Kingdom .
 Schenck, –, Union Army, Brazil
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Schenck, –, Union Army, Brazil