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Butler began his career as a sixteen-year-old apprentice with West Bromwich Albion before moving to Shrewsbury Town in 1973 .
 Butler, West Bromwich Albion, Shrewsbury Town
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Butler, West Bromwich Albion, Shrewsbury Town