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When a physical gap is added , a cultural rift between the classes comes into existence , an example being the perception of the well-mannered , " cultured " behavior of the rich , versus the " uncivilized " behavior of the poor .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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