15378
 But against the backdrop of war in Iraq , instability across the Middle East , growing debate about the world 's oil supply and the threat of global warming , environmental groups say that there are several reasons for the United States to require cars and trucks to burn less gasoline . 
 location contains: Middle East, Iraq
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: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 location contains: Middle East, Iraq