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In May 2018 , he briefly returned to rugby for a month , a game he has n't played since starting over Dan Carter in high school before retiring , citing diminishing knowledge of the game , and rugby fitness .
 Dan Carter
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Dan Carter