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Readout of President Obama 's Call with President Poroshenko of Ukraine http://t.co/Ac33lag8Z4 #MH17
 Obama, Poroshenko, Ukraine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Obama, Poroshenko, Ukraine