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One of factors that convinced the company that there was a market for a US-made competition sailplane was the great loss of value of the United States Dollar in the early 1970s which had made European sailplanes prohibitively expensive to US buyers .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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