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5 , in the Low Countries it improved to 1:14 with the introduction of the three-field system of crop rotation around the 14th century .
 Low Countries
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:
 Low Countries