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The installation of a separate traction network generally is done only if the railway in question uses alternating current ( AC ) with a frequency lower than that of the national grid , such as in Germany , Austria and Switzerland .
 Germany, Austria, Switzerland
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:
 Germany, Austria, Switzerland