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During the next few years the paper changed ownership several times , early owners including Russell Conwell , then a Somerville resident , and John A. Cummings , later mayor of the city .
 Russell Conwell, Somerville, John A. Cummings
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Russell Conwell, Somerville, John A. Cummings