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The visit came nearly one month after Emir of  Qatar  Sheikh  Hamad bin Khalifa  al - Thani met with Saleh on July 13 during which the two leaders agreed to reactivate the Doha peace agreement to cement the cease-fire deal between the northern rebels and the Yemeni government .
 Qatar, Hamad bin Khalifa
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:
 Qatar, Hamad bin Khalifa