15181
Of this number two formations especially stood out :  4th Mechanized Corps  (  Soviet Union  ) and 6th Mechanized Corps ( Soviet Union ) .
 country of headquarters: 4th Mechanized Corps, Soviet Union
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: 4th Mechanized Corps, Soviet Union