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Charles David Beard ( born October 2 , 1959 ) is a former right-handed pitcher in Major League Baseball for the Oakland Athletics , Seattle Mariners , Chicago Cubs , and Detroit Tigers from to .
 Beard, Major League Baseball, Oakland Athletics, Seattle Mariners, Chicago Cubs, Detroit Tigers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Beard, Major League Baseball, Oakland Athletics, Seattle Mariners, Chicago Cubs, Detroit Tigers