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Among the guests at the opening ceremony King Carol II of Romania , Prince Mihai of Romania and Prince Paul of Greece .
 Carol II of Romania, Mihai of Romania, Paul of Greece
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carol II of Romania, Mihai of Romania, Paul of Greece