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The character history of the Earth-Two Robin accordingly adopts all of the earliest stories featuring the character from the 1940 s and 1950 s , while the adventures of the mainstream Robin ( who lived on " Earth-One " ) begin later in time and with certain elements of his origin retold .
 Robin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robin