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Prior to her marriage , on 27 July 1914 , Ina Marie had also gained the title " Countess of Ruppin " , and from 21 June 1920 , was titled " Princess of Prussia " with the style Royal Highness .
 Ina Marie, Countess, Prussia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ina Marie, Countess, Prussia