1311
The Estonian Popular Front was founded in April 1988 On June 16 1988  Gorbachev  replaced Karl Vaino the ' old guard ' leader of the  Communist Party  of Estonia with the relatively liberal Vaino the Soviet ambassador to Nicaragua .
 Gorbachev, Communist Party
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:
 Gorbachev, Communist Party