956
--  Marathon  the oil producer and refiner based in  Houston  posted a 15 percent decrease in fourth-quarter profit citing lower natural gas prices higher exploration expenses and a decline in refining margins .
 city of headquarters: Marathon, Houston
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: Marathon, Houston