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 3 Africa 's Borderless Wars Foreign rebels have used the porous borders of Central African Republic , a potential bulwark against the chaos of its neighbors in Chad and the Darfur region of Sudan , as a staging ground to mount attacks over the border , spreading what the United Nations has called the world 's '' gravest humanitarian crisis . '' 
 location contains: Africa, Sudan
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: Africa, Sudan