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` ` Erdogan will be willing to engage in a bruising confrontation in a way that Gul was not willing to , ' ' said Bulent Aliriza , an analyst at the Washington - based Center for Strategic and International Studies .
 Washington, the Washington - based Center for Strategic and International Studies, Erdogan, Gul, Bulent Aliriza, an analyst at the Washington - based Center for Strategic and International Studies
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:
 Washington, the Washington - based Center for Strategic and International Studies, Erdogan, Gul, Bulent Aliriza, an analyst at the Washington - based Center for Strategic and International Studies