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While proportional representation tends to be associated with , and is mostly practiced in , countries which are governed by a parliamentary system , a number of theoretical benefits are accrued from the usage of PR in legislatures which are not charged with designating the executive head of government : However , it may also result in a number of drawbacks .
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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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