19897
 With sanctions preventing American oil companies from investing in Sudan , China has emerged as a key investor in the country , Africa 's third-largest oil producer after Nigeria , a longtime OPEC member , and Angola . 
 location contains: Africa, Angola
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, Angola