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The Greek socialist party 's executive bureau gave Prime Minister Costas Simitis its backing if he chooses to call snap elections , its general secretary Costas Skandalidis told reporters on Thursday .
 Greek, Costas Simitis, Costas Skandalidis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 Greek, Costas Simitis, Costas Skandalidis