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The  Common Market for Eastern and Southern Africa  ( COMESA ) was established in December 1994 to replace the former Preferential Trade Area ( PTA ) for Eastern and  Southern Africa  which had existed from the earlier days of 1981 .
 country of headquarters: Common Market for Eastern and Southern Africa, Southern Africa
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: Common Market for Eastern and Southern Africa, Southern Africa