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Singapore  President S R Nathan and Prime Minister  Lee Hsien Loong  on Tuesday wrote condolence messages to Cambodia on the stampede tragedy .
 countries of residence: Singapore, Lee Hsien Loong
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: Singapore, Lee Hsien Loong