Yi Gua is the forty-second of the sixty-four hexagrams in the Book of Changes. Wind and thunder are good for divination, but not for up and down divination. As the saying goes, bad luck, dead trees bloom again for many years, and branches and leaves are reborn. A few people have seen a few people boast. This hexagram is a superposition of different hexagrams (the next earthquake is the last one). Xun is the wind; Thunder. Wind and thunder agitate, the stronger its potential, the louder the thunder, and the wind and thunder help each other. This hexagram is the opposite of destroying hexagrams. It is a loss and benefit, and the latter is a loss and benefit. These two hexagrams explain the principle of profit and loss.