What do you mean, hanging is not empty?

"hexagrams are not empty" means that every hexagram can be calculated accurately and will never be wrong. If it's not accurate, it's empty, which means to make a trip in vain, and people don't work without paying. Under normal circumstances, there are only three situations where you don't have to pay, that is, people who are dying on their birthdays don't accept it, people who will be shipped off the assembly line don't accept it, and those who are unlucky don't accept it. When asking for divination, you usually give as much as you want. Money can't be too small, but it's best not to let divination fail.