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Early life Docker was born in Smethwick , Staffordshire , the son of Ralph Docker and his wife Sarah Sankey .
 Docker, Smethwick, Staffordshire, Ralph Docker
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Docker, Smethwick, Staffordshire, Ralph Docker