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According to Willy Lam a  China  expert at  Chinese University of Hong Kong  the investigations and trials are part of an anti-corruption campaign ahead of a major Communist Party meeting in September where fighting graft will be a theme .
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Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 None