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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 .
 founded by: Davey Tree Expert Company, Kent
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: 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} 
 Entity Pairs:  Davey Tree Expert Company, Kent 
Answer:
 founded by: Davey Tree Expert Company, Kent