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Early career In the fall of 1980 , Amerkhanian began a five-year stint with the Oakland Athletics Baseball Co. , working with Roy Eisenhardt ( '80 Cal frosh coach and A 's president ) .
 Amerkhanian, Oakland Athletics, Cal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Amerkhanian, Oakland Athletics, Cal