Edited sentence: All of the other senior students of Yip Man, including the directors of the Ving Tsun Athletic Association (VTAA) and Yip Man's two sons, have disputed Cheung’s claims.As an official successor to Yip Man was not named publicly, some Wing Chun exponents have been involved in the politics of claiming to be the rightful successor.Cheung claims that all the rest of Yip Man's students were taught what he calls the "Modified Wing Chun" system, alleged to be a simpler and less effective style taught to outsiders deemed unworthy to learn the true version.Cheung himself claims to be the only one who was taught what he calls the "Traditional Wing Chun" style, which he says was previously a secret, purer version of wing chun only taught to those expected to become the style's standard bearers