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Dave Masten the head of  Masten Space Systems  Inc. a bootstrap company with five employees has another explanation for the rocket boom in  Mojave  .
 city of headquarters: Masten Space Systems, Mojave
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:
 city of headquarters: Masten Space Systems, Mojave