Which book is the difference between heaven and earth and the difference between heaven and earth?

The formula of six hexagrams pretending to be the world should be: the sky is the same as two, the sky is different from five, and the earth is different from four. People are different from four people, and pure 63 is different from the world.

The world should be the most commonly used concept in six hexagrams divination. Generally speaking, the world should be regarded as itself or an aspect related to itself, as others or an aspect opposite to itself.