What's the name of the fortune telling card?

What's the secret of telling your fortune without asking your name?

1, one is a shadowless pen, which is a small pencil point that cannot be seen in the hand. When chatting with you, he secretly wrote it on a note. Later, he would take out a paper ball and say that he knew you were coming. Open the paper ball and have a look. Your name is in it. 2. Card method. On a big piece of cloth, there are many boxes with different words written on them. He will ask you to tell which box your last name is in, and then he will take out many cards with many words written on them. He will also ask you to tell which card your surname is on, and finally he will pretend to measure your hand with a ruler. In fact, you have told him your last name, because only one word in that card and that box is repeated. You will say: there are many repetitions in it. Yes, yes, there are many repetitions, but only one of those repetitive words can be used as a surname. I use the following two words to explain: A: Tian, Ren, De, Duo, Ge, Zhang, Guo, Feng, Min, Qu, Chong, Fang, Wei, Sun B: Wei, Ren, Yong, Yi, Zhang, Li, De, Guo, Sun, He, Feng, Ge, De,. Still pretending to measure your hands?