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Robert James Clasby ( born September 28 , 1960 ) is a former American football defensive lineman who played five seasons in the National Football League ( NFL ) .
 Clasby, National Football League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clasby, National Football League