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Sigurdur Helgason ( July 20 , 1921 – February 8 , 2009 ) was an innovator in low-cost airlines .
 person: Sigurdur Helgason
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: Sigurdur Helgason