What is the principle for fortune tellers to accurately guess surnames in front of Guoqing?

I know the convincing result through the forum next door, yes.

"It is unique that a surname in the card in hand overlaps with a surname on the ground",

Surnames on the ground are grouped according to hundreds of surnames, but there are many activity cards made by astrologers. In any activity card, only one surname coincides with the combination of surnames on the ground. For example, there is a word "Guan" in the activity card, and there is also a word "Guan" in the combination of surnames on the ground. The astrologer induced my nephew to hold the activity card with the word "Guan" in his hand, and then guided him to put it on the ground. The corresponding relationship between this activity card and the combination position of surnames on the ground is familiar to fortuneteller. As long as he puts the card with his surname on the ground where his surname is written according to the requirements of the physiognomist, he will know, because only one card is the same.

So when Columbus laid his eggs, he said that many things you don't know are incredible, and it is very simple to know.

Thank you again for your participation and guidance.