16727
 The issue has been regarded as the most intractable in the Balkans since NATO bombers forced Yugoslav security forces to withdraw from Kosovo in 1999 , halting what international war crimes prosecutors say was a brutal campaign to force ethnic Albanians to flee . 
 location contains: Balkans, Kosovo
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
 Entity Pairs:  Balkans, Kosovo 
Answer:
 location contains: Balkans, Kosovo