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 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: Guangzhou, Pearl River Delta