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By the mid-17 th century , approximately 900 windmills could be found along the river , some of them still preserved , particularly in the Zaanse Schans .
 Zaanse Schans
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Zaanse Schans