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Regional leaders in the  Southern African Development Community  ( SADC ) had named former  Botswana  president Ketumile Masire as a mediator in the dispute but he abrubtly ended a mission here last week complaining that the government had refused to engage in dialogue .
 country of headquarters: Southern African Development Community, Botswana
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: Southern African Development Community, Botswana