1206
The rebel groups were fighting to force the Soviet Union to withdraw from  Afghanistan  as well as to remove the Soviet-backed government of President  Mohammad Najibullah  .
 countries of residence: Afghanistan, Mohammad Najibullah
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:  Afghanistan, Mohammad Najibullah 
Answer:
 countries of residence: Afghanistan, Mohammad Najibullah