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Among them is 37-year-old Internet entrepreneur William  Ding Lei  once  China  's richest man who was among 10 billionaires who returned to the list after dropping off in past years .
 countries of residence: Ding Lei, China
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 countries of residence: Ding Lei, China