18714
 The threat to oil supplies from Nigeria , Africa 's largest oil producer , comes at a time of heightened concerns about the security of global supplies given the overall tightness in production and the rising demand for oil . 
 location contains: Africa, Nigeria
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Africa, Nigeria 
Answer:
 location contains: Africa, Nigeria