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This policy , which for many years applied both to signings from other clubs and to youngsters admitted to the club 's academy , has in recent years become more flexible , so that players whose career developed in the youth system of other clubs in the region are now acceptable , irrespective of their country of birth .
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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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