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'Em ergency ' player during 1948 World Series Rickert was not summoned to Boston when the Brewers ' season ended and returned home to his native Washington .
 Rickert, Boston, Brewers, Washington
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Rickert, Boston, Brewers, Washington