Fortune telling lies in the morning market.

I met a fortune teller at the morning market on Madong Road. Everyone said that he could guess your last name without asking a word. I don't believe it. I tried to calculate it once with two dollars, that's right. I still don't believe it. I tried to change someone's last name twice, and it was right again. The more I think about it, the more I think there is something fishy in it.

■ Daxian's tricks attracted many people to watch, and people who didn't understand the mystery inexplicably sent money to Daxian's pocket.

Our reporter Li Mohan's intern Shi Xiaoqian verified the report: "Daxian" can guess your surname without speaking. It really feels mysterious at first, but if you have insight into the mystery, you will know that this is just a scam.

Schematic diagram of calculating the mystery of surname

If you put 360 surnames in 360 grids, each surname has only one unique position, as shown in the figure. For example, a man named Wu came to ask for a visa:

Step 1: Select a card. He needs to choose card 2.

Step 2: Select inkjet. You need to choose Inkjet 3.

Step 3: Calculate the last name. In Card 2 and Ink Painting 3, there is only one surname overlapping, that is, Wu.

Guess three, he's better than Paul the octopus?

At 8 o'clock on July 30, Mr. Guo passed by the morning market of Shishi East Road and saw a man with a beard telling his fortune, and several citizens were watching.

"You don't have to ask your last name. If you get it right, you give me two yuan. If you are wrong, I will give you two yuan. " Seeing Mr. Guo standing by cheerfully, "Beard" said.

Next to three women in their fifties, they looked at the note in their hands, which read the so-called "fortune telling". "Did I just calculate it for you?" Mr. Guo poked his head out and asked. "quasi! Especially accurate! " All three women said. Mr. Guo couldn't help it, and took a few sheets of paper handed over by Beard.

There are thirty surnames printed on the palm-sized paper, so Mr. Guo can find the one with his surname first.

"Look here again and see which grid has it." "Beard" pointed to a one-meter-wide spray painting on the ground, with hundreds of surnames printed on it and divided into many grids. Mr. Guo just pointed to the grid with the word "Guo" printed on it, and "Beard" immediately said "Guo".

Sure enough, without saying a word, the "beard" was accurately calculated, and Mr. Guo was too surprised to speak. Was it a lucky guess? He decided to try again, taking his wife's surname as Liu. Look for it from the card first, then point out the grid with the word "Liu" printed on it, and the beard immediately says "Liu".

Mr. Guo still didn't believe it and changed his surname. As a result, he was guessed by Beard. Mr. Guo took out a total of six yuan and got three notes with the word "Fu" written on them.

The onlookers were also stunned. Someone said, "He is more magical than Paul the octopus who guessed the outcome of the ball game." .

Mr. Guo looked at it for more than ten minutes, plus himself, a total of five people counted their surnames. According to his rough estimate, there is still more than 20 yuan in the "beard" account.

The reporter's unannounced visit to the so-called mystery is just a trick.

A few days ago, the reporter came to the East Road Morning Market mentioned by Mr. Guo, and it was easy to find a "beard" in Lunan. He is about forty years old, with a full face of beard, a pigtail at the back of his head and a pair of jeans with dozens of holes under his dark coat. The floor is covered with pictures of hundreds of surnames.

"Beard" took the initiative to solicit "business" after seeing the reporter: "You don't have to ask, you will know your last name, and measure your life's future and destiny, two yuan once, and then pay after the calculation."

Subsequently, the reporter selected cards and grids according to the steps, and "beard" was a guess. He took out a piece of paper that said "Lucky" and accepted 2 yuan's money. The words "White Crane Magic" are printed on the note, which is nothing more than words wishing longevity.

Then the reporter observed for more than ten minutes and found that "beard" actually used the principle of permutation and combination in mathematics. He has a total of 12 cards, and each card has 30 surnames, a total of 360 cards. Floor painting is to divide hundreds of surnames into 30 grids, and each grid has 12 surnames.

The first card selection is to lock the surname in 30 ranges; Then choose from 30 grids separated by inkjet printing. In fact, the 30 surnames on the card have already been assigned to the 30 grids of inkjet printing, so there is only one overlapping surname in the grid of the card and inkjet printing. "Beard" remembers the surnames of each card and each grid, and can quickly find out the overlapping surnames, that is, "calculate" the surnames of fortune tellers.

If the fortune teller's surname is not among the 360 surnames at all, the beard can't "calculate" the fortune teller's surname. ■ Cartography/Dong Hai

■ Figure/Intern Shi Xiaoqian

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