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Ukrainian Prime Minister  Yulia Tymoshenko  said Tuesday she was optimistic the crises that have plagued the transit of Russian natural gas via  Ukraine  were a thing of the past .
 Yulia Tymoshenko, Ukraine
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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} 
Answer:
 Yulia Tymoshenko, Ukraine