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The city also contains two botanical gardens , the Botanischer Garten Duisburg-Hamborn and the Botanischer Garten Kaiserberg , as well as a number of municipal parks .
 Botanischer Garten Duisburg-Hamborn, Botanischer Garten Kaiserberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Botanischer Garten Duisburg-Hamborn, Botanischer Garten Kaiserberg