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In 1901 he published his theories on tree surgery with his book The Tree Doctor and later established the  Davey Tree Expert Company  in 1909 which led to  Kent  becoming known as The Tree City .
 Davey Tree Expert Company, Kent
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 Davey Tree Expert Company, Kent