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In addition to the Senne , tributary streams such as the Maalbeek and the Woluwe , to the east of the region , account for significant elevation differences .
 Senne, Maalbeek, Woluwe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Senne, Maalbeek, Woluwe