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Past speakers at WIF-KL include current and former Malaysian Prime Ministers  Tun  Dr.  Mahathir bin Mohamad  and Dato ' Sri Haji Mohammad Najib bin Tun Haji Abdul Razak .
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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:
 NA: Tun, Mahathir bin Mohamad