7240
In Sendai a - per-day refinery owned by the largest refiner in  Japan  JX  Nippon Oil  Energy was also set ablaze by the quake .
 country of headquarters: Japan, Nippon Oil
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: Japan, Nippon Oil