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From December 19 , 1777 to June 19 , 1778 , the main body of the Continental Army ( approximately 12,000 troops ) was encamped at Valley Forge .
 Continental Army, Valley Forge
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:
 Continental Army, Valley Forge