Today's night is fine and the moon is bright.

Chang'an is still catching arsonists, and Dali Siqing Dai Xuan does not believe that it is a demon fire.

Xu Jingzong was still taken into Dali Temple for interrogation by Dai Guan.

After several interrogations, Xu Jingzong's words and alibi were perfect.

Except for a walk around these places the day before.

Nothing out of the ordinary.

Dai Xuan observed Xu Jingzong's expression and asked, "Do you expect that our Dali Temple will not find any clues?" ”

Xu Jingzong said with a smile: "Dali Siqing is clear-sighted, and he will definitely be able to clean up the next one." ”

Dai Xuan observed Xu Jingzong's expression, as a Dali Siqing, it was really the first time he had encountered such a bizarre case.

In a sense, Xu Jingzong is indeed innocent, because the witnesses of this arson case saw with their own eyes that no one set the fire at all.

Dai Xuan said weakly: "You go back, if there is something Dali Temple will come to you again." ”

Xu Jingzong got up and left.

After Xu Jingzong left, the officials of Dali Temple said to Dai Guan: "Dali Temple, just let Xu Jingzong go?" ”

Dai Xuan smiled bitterly and said, "Do you have any incriminating evidence to hold him?" ”

The little official stood aside and was silent, if it was really Xu Jingzong's fire, then the modus operandi was too perfect.

A few eyeliners in Jingyang came to Chang'an City to send a topic into the city gate.

Then the guards at the city gate took the title all the way to the palace.

Chang'an is still catching arsonists, and Li Shimin has not slept.

After receiving the news sent, although Li Zheng has no power and no power at the moment, Jingyang has always had eyeliner in the palace.

Secretly staring at Li Zheng's every move, Li Shimin is not a selfless person, and he must be cautious and woo people like Li Zheng, and even more so guarded.

When he opened the case file and looked at the content on it, Li Zheng did not go to the Lantern Festival, but his students were stumped by three questions.

Nine Palaces Connection?

Li Shimin took out his pen and ink and tried to draw the answer.

After drawing it several times, I still didn't come up with an answer.

Four straight lines in one stroke, which seems to be impossible at all.

Li Shimin redrew the nine-square grid and handed it to the eldest grandson queen on the side.

Empress Changsun looked at the title and said, "Your Majesty can't draw it, how can you draw the concubine's body." ”

"You might as well try."

Empress Eldest Sun tried to take a few strokes of the topic, and redrew another one but failed, "How can there be such a torturous topic." ”

Li Shimin said with a smile: "This is a question drawn by Li Zheng's students. ”

"I'm afraid it's not Li Zheng's idea."

Li Shimin handed the topic to the eunuch on the side and said, "I'm afraid that Qingque and Chengqian haven't slept tonight, you give the topic to the two of them to try." ”

"Whoa."

There was such a big arson case in Chang'an, and now the city is full of turmoil.

Li Chengqian really hadn't slept yet, looking at the question sent by his father.

Looking at the title, he said to himself: "Nine palaces are connected, and four straight lines are completed in one stroke?" ”

After trying several times, Li Chengqian found that no matter how he painted, he couldn't connect it with four lines.

The Mansion of King Wei

Li Tai also received the question and handed it over to the staff and disciples in his house.

More than a dozen people studied this topic together, and finally came to a conclusion that this nine-palace connection could not be completed at all.

Even if you want to complete it in one stroke, you have to have a fifth straight line.

Li Tai was a little puzzled, this was a question sent by his father.

I heard from the eunuch who sent me that this is also a problem with Li Zhengjingyang.

After several failed attempts, Lee Tae gave up.

Jingyang

Two hours passed, and still no one could draw it.

Da Niu remembers that his teacher said that this is a question that tests the thinking mode.

If you use fixed thinking, you can't solve it at all.

The most difficult part of the nine-palace connection problem is that.

People's minds and attention are always on the nine palaces, and if your eyes are always locked on the nine dots, no matter how hard you rack your brains, you won't be able to draw them.

But if you look away from the nine dots and look beyond the nine houses, you will suddenly become enlightened.

Seeing that some people still couldn't answer, some people said impatiently: "This can't be drawn at all!" ”

"That's right! It's simply not possible. ”

The drowsy bull was woken up by them again, and listening to their discussions, the bull lifted his spirit and said, "Actually, there is an answer to this question. ”

"There are so many of us who can't figure it out, but you can solve it for us."

"Yes!"

Da Niu glanced at Li Yifu on the side, and was already asleep against a tree.

Scratching the back of his head helplessly, Da Niu turned over the sign with a consistent question on it.

Everyone held torches and saw the words on the other side, and couldn't help but read them, "One hundred times." ”

A large group of scholars and scholars were speechless for a long time.

"Too much deception!"

"A hundred? Where did so much money come from? ”

"This is clearly blackmail!"

……

The crowd was filled with righteous indignation and shouted and cursed.

The bull turned a deaf ear to these shouts and curses.

I was a little proud in my heart, but I didn't expect that the teacher's question could stump so many people.

"If you can't solve this problem, I'm afraid I won't be able to sleep well for many days."

"It's just angry with me, this Li Zheng is embarrassing people."

Di Zhixun took Di Renjie's hand, walked all the way and took out a few pieces of silver cakes and handed them to Da Niu, "These should be worth a hundred yuan." ”

After taking the silver cake, Da Niu smiled and said, "Want an answer? ”

Dickinson nodded.

With his back to everyone, Da Niu drew a picture and handed it to Di Zhixon.

Taking the picture and looking at it, Di Zhixun smiled for a long time and said, "So that's the case, the old man understands!" It's so simple. ”

There are many people below, all of whom are looking up, "What is the answer?" ”

Someone asked aloud, "Show us how to draw this." ”

Everyone looked at Di Zhixun, only to see that after he put away the picture, he left without saying a word.

Walking all the way, Di Renjie asked his father, "Father, why don't you show them this solution." ”

Di Zhixun smiled and handed the picture to Di Renjie.

After Di Renjie saw it, his thoughts suddenly became clear, "It turned out to be drawn like this." ”

"Do you know why I couldn't draw it before?" Dickinson asked.

The young Di Renjie thought for a while and said, "Because the child's eyes have always been on the nine points, but he has ignored the outside of the nine palaces. ”

Di Zhixun smiled and nodded, "Sometimes we don't limit ourselves, if we let go of our vision, you will have another feeling, when you look at it intently, your vision will become blurred, Li Zheng's question looks simple, and the deep meaning of it really makes people have to sigh." ”

Di Renjie looked at this picture, and the more he looked at it, the more interesting it became.

Di Zhixon whispered, "Remembering this picture will benefit you a lot in the future." ”