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He played all or part of nine seasons in Major League Baseball , primarily as a shortstop , but is better known for his tenure as general manager of the Seattle Mariners .
 Major League Baseball, Seattle Mariners
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Major League Baseball, Seattle Mariners