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He was the first President of the United Nations Security Council in 1946 , and served as Ambassador to the United States from 1946 to 1951 .
 United Nations Security Council, 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:
 United Nations Security Council, United States