4752
Rocky Nelson was Founder and President of Arizona Airways from its founding in 1942 until its merger with Challenger and Monarch Airlines June 1 1950 to form  Frontier Airlines  headquartered in Denver  Colorado  .
 state or province of headquarters: Frontier Airlines, Colorado
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:
 state or province of headquarters: Frontier Airlines, Colorado