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Work on the book In the spring of 1931 , Swedish economist Gunnar Myrdal and Alva Myrdal wrote an article on Social Policy and Demography .
 person: Gunnar Myrdal; person: Alva Myrdal
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Gunnar Myrdal, Alva Myrdal 
Answer:
 person: Gunnar Myrdal; person: Alva Myrdal