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Wolfowitz said Saturday in Singapore that Washington hoped putting pressure on North Korea ' s battered economy would resolve the nuclear standoff .
 Singapore, Washington, North Korea, Wolfowitz
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 Singapore, Washington, North Korea, Wolfowitz