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WASHINGTON -- The Supreme Court said Tuesday that it will review former  Enron  Chief Executive Jeffrey Skilling's conviction to see if he received a fair trial in the hothouse atmosphere of  Houston  following the collapse of the nation's seventh largest company in 2001 .
 city of headquarters: Enron, Houston
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:  Enron, Houston 
Answer:
 city of headquarters: Enron, Houston