4663
The flow from Africa began in the 1970 's , mostly with refugees from Ethiopia and Somalia , and escalated in the 1990 's , when the number of black residents of the United States born in sub-Saharan Africa nearly tripled .
 location contains: Africa, Ethiopia; location contains: Africa, Somalia
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: 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} 
 Entity Pairs:  Africa, Ethiopia; Africa, Somalia 
Answer:
 location contains: Africa, Ethiopia; location contains: Africa, Somalia