Yi Yao, mathematics in the Book of Changes. It is a software that combines Plum Blossom Yishu and Liuyao for prediction of hexagrams. The ad-free version will have ads and some functions will be randomly blocked. All functions are basically the same as the practical charging version. The main function: 1. Support time, a variety of digital hexagrams, six lines, self-defined combinations, and analogy plus orientation and other hexagram methods. 2. Combining the time of starting the hexagram, a