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During the 1970 s , experimental initiatives for low-energy buildings were made in Denmark , the United States , Sweden , Canada , and Germany .
 Denmark, United States, Sweden, Canada, Germany
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:
 Denmark, United States, Sweden, Canada, Germany