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Prince Somsanith Vongkotrattana ( 19 April 1913 – 1975 ) was the Prime Minister of Laos .
 Somsanith Vongkotrattana, Laos
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Somsanith Vongkotrattana, Laos