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The Residence of the Embassy of Cameroon in Washington , D.C. , also known as the Christian Hauge House , is the official residence of the Ambassador of the Republic of Cameroon to the United States .
 Cameroon, Washington , D.C., Republic of Cameroon, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cameroon, Washington , D.C., Republic of Cameroon, United States