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Alan Glenn Haller is a retired professional American football player who played defensive back in the National Football League with the Pittsburgh Steelers , Cleveland Browns and Carolina Panthers .
 Alan, Haller, National Football League, Pittsburgh Steelers, Cleveland Browns, Carolina Panthers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alan, Haller, National Football League, Pittsburgh Steelers, Cleveland Browns, Carolina Panthers