Primary and secondary rhythm is a set of foreign exchange technology theory created by Mr. Matsui. He has a training class, and his videos are also on Youku. Major websites also have sellers' books with sub-rhythm. It turned out to be Denfoot's foreign exchange platform, and then there was something wrong with the platform. It seems that the money has been returned (I didn't fire it). I read the whole book, mainly based on Dow theory, and then added filippo time period. It's just an ordinary technical book with no innovation.