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Psychologist Bruno Bettelheim argues that the main motif is about dependence , oral greed , and destructive desires that children must learn to overcome , after they arrive home " purged of their oral fixations " .
 Bruno Bettelheim
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bruno Bettelheim