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Given his voting record -- Congressional Quarterly ratings show he voted with his party 92 percent of the time in 2005 and with Mr. Bush 95 percent of the time -- Mr. Santorum 's ultimate challenge may come in the Philadelphia suburbs in southeastern Pennsylvania , home to many socially moderate Republicans and independents .
 location contains: Pennsylvania, Philadelphia
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: 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} 
Answer:
 location contains: Pennsylvania, Philadelphia