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Louis Richard Mahrt ( July 30 , 1904 – August 1982 ) was a professional football player in 1926 and a player-coach in 1927 for the Dayton Triangles of the National Football League .
 Mahrt, Dayton Triangles, 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:
 Mahrt, Dayton Triangles, National Football League