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Nicolai A. Grevstad ( 2 June 1851 - 20 February 1940 ) was an American diplomat , politician and newspaper editor .
 Nicolai, Grevstad
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nicolai, Grevstad