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Countess Ina von Ruppin ( 27 January 1888 – 17 September 1973 ) was the wife of Prince Oskar of Prussia .
 Countess Ina von, Prince Oskar of 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:
 Countess Ina von, Prince Oskar of Prussia