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The McDonnell XHJH Whirlaway was a 1940s American experimental twin-rotor helicopter designed and built by McDonnell Aircraft for the United States Navy .
 McDonnell, American, McDonnell Aircraft, United States Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 McDonnell, American, McDonnell Aircraft, United States Navy