QingNanAoYou 青囊奥语, is another text book of FengShui believed to have been written by YangGong and yet 2 apparent versions from 2 different schools of thought.
In summary, classical texts are often distorted beyond recognition. YangGong did not write any of these classics. It was written by his students. Jiang DaHung commentaries on this classic is a sheer attempt to distort it further to his inclination and understanding. Often than not, he is labeled as a con-artiste instead. Yet, contemporary observation of masters from both schools showed tremendous results. What is your say?
PS: Graphics from http://bazifenshui.blogspot.com/2013/09/ching-nan-au-yo.html