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The Rotorcraft XR-11 , known by the company as the X-2 Dragonfly , was an American two-seat lightweight helicopter built in the 1940s for evaluation by the United States Air Force by the Rotorcraft Corporation of Glendale , California .
 location: American
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: American