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Tom Pickett ( 1858 – May 14 , 1934 ) was a 19th-century American cowboy , professional gambler and , as both a lawman and outlaw at various points in his life , was an associate of Dave Rudabaugh and later Billy the Kid .
 Tom Pickett, Dave Rudabaugh, Billy the Kid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tom Pickett, Dave Rudabaugh, Billy the Kid