999
In 1940 Vlasov was promoted to major general and on June 22 1941 when the Germans and their allies invaded the  Soviet Union  Vlasov was commanding  4th Mechanized Corps  .
 country of headquarters: Soviet Union, 4th Mechanized Corps
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:
 country of headquarters: Soviet Union, 4th Mechanized Corps