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Clausen went undrafted in the 2004 NFL Draft and was briefly signed by the Kansas City Chiefs as a free agent where he spent some time in NFL Europe .
 Clausen, NFL, Kansas City Chiefs, NFL Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clausen, NFL, Kansas City Chiefs, NFL Europe