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POTUS msg to Dutch ppl after signing condolence book : " Will not rest until we 're certain that justice is done . " #MH17 http://t.co/BcmSqvqwJU
 POTUS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 POTUS