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In 2015 , Sofia was ranked 30th out of 300 global cities in terms of combined growth in employment and real gross domestic product ( GDP ) per capita , the highest one amongst cities in Southeast Europe .
 Sofia, Southeast Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sofia, Southeast Europe