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Led by Morgan Tsvangirai with a short-lived faction led by  Arthur Mutambara  the  MDC  which presses for social and political liberalism and is backed by the Zimbabwe Congress of Trade Unions and the Open Society Initiative for Southern Africa soon usurped the opposition position in Parliament against the ZANU-PF .
 founded by: Arthur Mutambara, MDC
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:  Arthur Mutambara, MDC 
Answer:
 founded by: Arthur Mutambara, MDC