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Before launching Jeffrey Banks Ltd. in New York City in 1978 at the age of 25 , he worked as a design assistant to Ralph Lauren ( 1971-73 ) and Calvin Klein ( 1973-76 ) . .
 Ralph Lauren, Calvin Klein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ralph Lauren, Calvin Klein