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In 2003 - 04 , he returned to AIK , then playing in Sweden 's second-tier league , the Allsvenskan .
 AIK, Sweden, Allsvenskan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 AIK, Sweden, Allsvenskan