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Early adulthood generally refers to the period between ages 18 to 29 , and according to theorists such as Erik Erikson , is a stage where development is mainly focused on maintaining relationships .
 Erik Erikson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Erik Erikson