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Super Mario Galaxy 2 " , the sequel to " Super Mario Galaxy " , was initially developed as an expansion pack to the latter , although it eventually developed into its own game , released on May 23 , 2010 .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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