Easy numbers. Type a number.

"Yi Shu" is a Chinese vocabulary, which comes from Strange Tales from a Lonely Studio. According to "Yi Shu", it is interpreted as a divination method. According to the method of divination in the Book of Changes. Numbers, magic. In Wu Zeng's Notes on Changing Zhai in Song Dynasty, Yuan Yong paid attention to the number of the Book of Changes, so it was the first person, so it was 1.