8370
 But blackouts have been a serious problem for years here in Guangzhou , the biggest city in the Pearl River Delta , and they are worse this spring as oil-fired plants have shut down , though coal-fired power plants have kept running . 
 location contains: Guangzhou, Pearl River Delta
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:  Guangzhou, Pearl River Delta 
Answer:
 location contains: Guangzhou, Pearl River Delta