7783
In 1968  he  joined the Communist Party of  Slovakia  supposedly to support Alexander Dub?ek's reforms but he was expelled from the party after the Warsaw Pact invasion in Czechoslovakia in August 1968 ( see History of Czechoslovakia ) .
 countries of residence: he, Slovakia
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:  he, Slovakia 
Answer:
 countries of residence: he, Slovakia