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Several writers claim that , years later , Geli Raubal , Hitler 's niece ( and possibly his lover for a period , although many authorities doubt their relationship was consummated ) was jealous of Hitler 's association with Erna .
 Geli Raubal, Hitler, Hitler, Erna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Geli Raubal, Hitler, Hitler, Erna