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During the 1970s Australia's two domestic airlines Trans Australia Airlines and Ansett provided regular scheduled services to most Australian capital cities and also  Papua New Guinea  while in 1975  Air Niugini  became the first international airline to commence flights out of Cairns to Port Moresby in Papua New Guinea .
 country of headquarters: Papua New Guinea, Air Niugini
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:
 country of headquarters: Papua New Guinea, Air Niugini