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Timothy Joseph Leiper ( born July 19 , 1966 , at Whittier , California ) is an American professional baseball coach and manager .
 Leiper, Whittier , California, American
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, Whittier , California, American