6686
He met Doug Sahm , his future collaborator in the Texas Tornadoes , at a battle of the bands in 1960 , on the roof of San Antonio 's Town Twin Drive-In .
 place of birth: Doug Sahm, San Antonio; location contains: Texas, San Antonio
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Doug Sahm, San Antonio; Texas, San Antonio 
Answer:
 place of birth: Doug Sahm, San Antonio; location contains: Texas, San Antonio