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Spencer Clay Shiver ( born December 7 , 1972 ) is a former American college and professional football player who was an offensive lineman in the National Football League ( NFL ) for three seasons during the 1990s .
 Clay Shiver, 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:
 Clay Shiver, National Football League