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The first aerosanis may have been built by young Igor Sikorsky in 1909 – 10 , before he built multi-engine airplanes and helicopters .
 person: Igor Sikorsky
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:
 person: Igor Sikorsky