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The principal rivers in Catalonia are the Ter , Llobregat , and the Ebro ( Catalan : ) , all of which run into the Mediterranean .
 Catalonia, Ter, Llobregat, Ebro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Catalonia, Ter, Llobregat, Ebro