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Estonia broke free from the crumbling Soviet Union in  1991  but unlike former East Germany where the Stasi secret police archives shed light on former agents and collaborators most  KGB  files from Estonia were taken to Russia or destroyed before independence .
 None
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:
 NA: 1991, KGB