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A7 Tensions Mount in Africa With the unrest in Sudan 's Darfur region spreading into neighboring countries , Chad broke off relations with Sudan and threatened to oust 200,000 Sudanese refugees after staving off a rebel incursion into its sand-strewn capital .
 Sudan, Darfur; Sudan, Darfur; Darfur, Sudan; Sudan, Darfur; Sudan, Darfur; Africa, Sudan; Darfur, Sudan; Africa, Sudan; Africa, Chad
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 Sudan, Darfur; Sudan, Darfur; Darfur, Sudan; Sudan, Darfur; Sudan, Darfur; Africa, Sudan; Darfur, Sudan; Africa, Sudan; Africa, Chad