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Founders of technology companies include Ralph J. Roberts ( co-founder of Comcast )  Elon Musk  ( founder of Paypal Tesla Motors and  SpaceX  ) Leonard Bosack ( co-founder of Cisco ) David Brown ( co-founder of Silicon Graphics ) and Mark Pincus ( founder of Zynga the company behind Farmville ) .
 founded by: Elon Musk, SpaceX
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Elon Musk, SpaceX 
Answer:
 founded by: Elon Musk, SpaceX