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Frederick ( Frits ) Koolhoven ( 11 January 1886 – 1 July 1946 ) was an aircraft designer in Britain and his native Netherlands .
 Frederick, Koolhoven, Netherlands
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frederick, Koolhoven, Netherlands