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The northeast border with Silesia runs partly along the Moravice , Oder and Ostravice rivers .
 Silesia, Moravice, Oder, Ostravice
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Silesia, Moravice, Oder, Ostravice