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Leiper , a former outfielder , had a 12-season ( 1985 – 1996 ) minor league playing career in the farm system s of the Detroit Tigers , Pittsburgh Pirates , New York Mets and Kansas City Royals , batting .273 with 40 home runs in 1,166 games and 3,910 at bats .
 Leiper, Detroit Tigers, Pittsburgh Pirates, New York Mets, Kansas City Royals
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leiper, Detroit Tigers, Pittsburgh Pirates, New York Mets, Kansas City Royals