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Playing career Chamberlain graduated through the Port Vale youth team to make his senior debut on 31 December 1977 , in a 3 – 0 win over Rotherham United at Vale Park .
 Chamberlain, Port Vale, Rotherham United, Vale
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chamberlain, Port Vale, Rotherham United, Vale