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 a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 countries of residence: Afghanistan, Mohammad Najibullah