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Service D was a small group of the Belgian resistance during the Second World War which operated chiefly in the provinces of Luxembourg , Liège and Limburg .
 Service, Luxembourg, Liège, Limburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Service, Luxembourg, Liège, Limburg