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Finally, I would like to thank my wife as a lifelong companion for her loving care during all those years of writing, revising, and updating this book, and Ouyang Chi for his obedience to and willing cooperation with me. As a son he has sacrificed much with a father who hasn’t been able to spend much time playing with him because of the demanding work.
Without the friendship and selfless help from all the people mentioned above, this book could never have been written.