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Einar Dahl ( born 1 March 1904 in Falun ; died 17 January 1979 in Uddevalla , Sweden ) was a Swedish Esperantist who worked first as an elementary school teacher and later as a school principal in Uddevalla .
 Einar Dahl, Falun, Uddevalla, Sweden, Swedish, Uddevalla
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Einar Dahl, Falun, Uddevalla, Sweden, Swedish, Uddevalla