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In the spring of 2008 , Nixon , 73 , was named a roving instructor in the Texas Rangers ' farm system by its new club president , Nolan Ryan .
 Nixon, Texas Rangers, Nolan Ryan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nixon, Texas Rangers, Nolan Ryan