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The Economic System of Socialism ( ESS ) was an economic policy implemented in East  Germany  between 1968 1970 led by General Secretary of the Socialist Unity Party  Walter Ulbricht  .
 country of headquarters: Germany, Walter Ulbricht
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:  Germany, Walter Ulbricht 
Answer:
 country of headquarters: Germany, Walter Ulbricht