This is part of the manufacturer's explanation. A technical book that explains the mechanical decision-making rules for achieving "unei-tori" (wave taking) and how to use them. It specifies the judgment of yin and yang using a simple line chart connecting daily closing prices, and a three-part position management system. The trading rules (logic) are a translation of practitioners' intuition into mathematical formulas, making them suitable for practical application while connecting with intuition. After becoming accustomed to mechanical trading, you can also arrange it to your liking by adding your own rules. Because it is a universal judgment standard, it has been a long-selling product since its release in 1974 without any changes to the rules. In my personal opinion, the condition is not bad. The condition of the product is shown in the photos. This is a used item, so please only purchase if you understand this point.