6592
This economic cooperation agreement between three cities in three countries has created one of the most innovative regions in the European Union ( measured in terms of money invested in technology and knowledge economy ) ; the agreement is based on the cooperative triangle that connects the three technical universities in those cities .
 European Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 European Union