The emerald jade talisman is still changing. With the jade talisman as the center of the circle, countless silk threads were issued and launched in all directions, slowly intertwining into a large complex net.

Mu Heng reached out and touched a thread beside him, but he didn't feel the entity, and suddenly felt strange.

"This is the line of cause and effect, you can't see it." The national teacher was very amused when he saw him looking stupid.

"Oh."

The national teacher looked at Mu Heng curiously, thinking in his heart that the other party didn't look like a capable sage, how could he solve the prohibition in this jade talisman, he obviously looked stupid.

The causal line passed through Mu Heng and the national teacher, as if he had been entangled, and as if he had made some decision to disperse the causal line. Then the jade talisman emitted light, opening a space out of thin air, and a gate was faintly emanated.

Yes, it's the gate, but it's a little weird. The door is turquoise and pentagonal, so it is not clear what the material is, and there are five different types of inscriptions engraved on the door.

The reason why it is called a door is mainly because it is locked. In the corner of the pentagon, a lock is installed on each side. You don't have to guess to know that this Great Dao Sutra must be hidden behind this gate.

And what Mu Heng wants to help the national teacher solve is these five locks.

The national teacher popped out the aura for the third time. Unlike the previous two times, this time the aura that popped up was divided into five and flew towards the five corners of the pentagon.

The stimulated lock released small formations as if it had been notified.

"Childe, please." At this point, the national teacher turned his head to look at Mu Heng and signaled that he could do it.

Mu Heng stepped forward and observed the five small formations. Without a teacher, he stretched his hand into the formation, and at the same time released his spiritual power to perceive the effect of the formation.

Immediately afterward, the five small formations changed again, and one by one the runes were evolved. Looking at the runes alone, Mu Heng couldn't understand a word, but as long as he felt it, he could clearly understand his content.

With such a result, Mu Heng was also impressed by this arrangement. The person who arranged this formation took into account that the characters of each ethnic group of the human race were different, so they used this kind of rune that did not need to be learned but could be understood.

"It's amazing." Mu Heng admired the ability of the caster, and at the same time was glad that he did not expose the embarrassment of his illiteracy.

"These questions will disappear within three breaths, and after three breaths, they will become different topics, so if you want to unlock these five prohibitions, you must solve them all within three breaths." When the national teacher thought of the ban that had tormented him for countless years, he didn't want to take another look.

"Three breaths? That is, half a minute? Mu Heng estimated his breathing time, and three breaths were about half a minute.

"Well, so you have to be fast and accurate." Although the national teacher didn't want to look at the topic more, he always locked his eyes on Mu Heng. The problem of solving the ban is about to be solved by the little guy in front of him, and the thousand-year-old wait is finally about to usher in the dawn.

Thinking of this, the national teacher couldn't help but feel a little excited, and his eyes looking at Mu Heng were also full of brilliance.

Knowing some of the circumstances of the ban, Mu Heng quickly swept through all the questions, which were different from the questions on the bulletin board outside, but the question type was the same.

The five questions are the summation of the equal difference series, the nature of light propagation, the calculation of gravity, the analysis of binary equations, and the analysis of probabilities.

The data is simple, and Mu Heng is not difficult to calculate. With a little thought and mental arithmetic, you can get the answer. Secretly memorized the time, and it was about a breath.

However, Mu Heng did not answer in time, but waited for the topic to change again after three breaths.

"It's time." After Mu Heng took three breaths, the topic in the Five Dao Formation changed again. However, it is only a superficial change, such as the probability analysis problem, which has become the possibility of two dice, ball pairs.

The second change question was also answered by Mu Heng within one breath.

Of course, there is no hands-on solution for the time being. Instead, he looked at the national teacher and said suspiciously: "I have some questions, and I ask the national teacher to solve my doubts." ”

"Childe, excuse me." Since the national teacher promised to help Mu Heng, he treated the latter very politely.

"Although these questions change quickly, if the national teacher puts some effort into recording all the question types, and then analyzes the answers, and keeps them in mind, it must not be difficult to answer these questions." Mu Heng guessed that although this question has changed, there should still be a question bank after all, and the fill-in-the-blank questions are treated as multiple-choice questions, and the correct answer can always be made.

Seeing Mu Heng ask such a question, the national teacher suddenly looked bitter and said: "I have naturally thought of such methods, but since I started to study these topics, I have not repeated them for a thousand years, not to mention how many colors there are like light, and I don't know how to answer them at all." ”

"I see." Mu Heng said secretly in his heart. It turns out that it is not that the question bank is established, but that the data is random, so it is basically impossible to repeat it.

It is not difficult to do this, as long as you refer to the irrational number and continue to calculate, then there will be endless irregularities and data.

No wonder the demon clan can't parse it with this method. Mu Heng stared at the five questions again, and he was even more determined in his heart that the person behind this was coming for him, and maybe the other party was also involved in how he came to this world. It is very unlikely that the people of this world will be able to understand the knowledge of the earth.

Thinking of this, Mu Heng felt an urge to find his way home, maybe there was really a play.

"There's a long way to go." Four words flashed through Mu Heng's mind.

Back to the present, since the person behind him is coming for himself, the possibility of obtaining this Great Yantian Cause and Effect Dao Sutra by himself should be more than that of the National Teacher.

After all, the basis used to break the ban is the knowledge of the earth, and it is impossible for this world, whether it is a human race or a demon race, to master this knowledge. There is no one else who can break these prohibitions but himself.

Besides, since this thing belongs to the human race, that person should not leave a loophole for the demon race to get rid of.

Mu Heng had already seen through the tricks of the national teacher in the illusion, but he didn't have a good way to solve the problem, so he didn't rush out, and with Tu Su by his side, life was quite good.

At the same time, it is also to tell the national teacher that such torture cannot make Mu Heng succumb to it, so as to win the national teacher to give up this method.

In the last five hundred years, Mu Heng contacted the process of dealing with the national teacher before, as well as the analysis of the topic of the Saiwen Society, Mu Heng got some unexpected results, which is also the main reliance of Mu Heng from the illusion, that is, to seize the creation of the national teacher.

"By the way, I forgot to ask the national teacher how long it has been since I stayed in the illusion world for fifteen hundred years and in the real world." Mu Heng asked harmlessly.

"Half a breath." The national teacher replied.

"It's okay, it's not long." Mu Heng also admired the methods of the national teacher, all his feelings in the illusion realm were so real, and the means of the Liangyi realm were amazing.

The corners of his mouth were smiling, and he didn't know if he was glad that he hadn't delayed for too long and wouldn't miss Ye Qingyin's competition. still learned about the secret behind the Great Dao Sutra, and it was impossible for the national teacher to obtain the treasure.

"Childe, please solve the problem as soon as possible, it will change later." The national teacher glanced back at the enchantment and said to Mu Heng.

"Okay." Seeing the third change of the five formations, Mu Heng grabbed the first number question and quickly calculated the answer in his heart. However, he did not rush to answer, but calculated the time in his heart.

"By the way, the national teacher, I figured out the answer, how should I tell him?" Mu Heng pointed to the formation and asked. Mu Heng, who doesn't know much about cultivation, although he is good at solving problems, he doesn't know where to start.

"Reach into the formation and infuse it with spiritual power, while silently reciting the answer in your mind, the formation will automatically recognize." The national teacher explained carefully.

"Oh."

Combined with the frequency of counting, when Mu Heng was on the ground for twenty seconds, he entered the answer into the formation according to the method told by the national teacher.

The formation that got the answer seemed to come to life, changing by itself, as if unlocked, and the originally chaotic runes suddenly became orderly, and Mu Heng was amazed when he saw it.

"Ding." After the transformed runes were regularized, the formation suddenly bloomed with dazzling light, and countless mystical Dao rhymes were released from the formation.

"It's the taste of cause and effect, and that's great." When the national teacher saw this scene, he was immediately pleasantly surprised. I have led my people to study for an unknown number of years, but I have never gained anything. Now that I have solved one of the formations this time, I am very happy to see such a wonderful Dao rhyme for the first time.

I continued to read the seconds in my heart, and when it was thirty seconds, the unsolved formation continued to change, like going back in time, and the formation returned to its previous appearance in the order just now.

"Childe, are you in trouble?" The formation of the national teacher's insight was locked again, and he was inevitably disappointed in his heart, worried that although Mu Heng could solve the problem, he would not be able to keep up.

"It's difficult, the time is too short, and it's too difficult to solve it all in such a short time." Mu Heng's face was bitter, very embarrassed.

"Don't rush, wait a little longer. If the question is more difficult, Childe might as well give up first, and then concentrate on solving the problem next time when the five questions are easier, so as not to waste time on the difficult problem. The national teacher said step by step.

When Mu Heng heard this, he suddenly felt funny in his heart. Since the type of question has been decided, there is no question of whether it is difficult or not for me. It's just that Mu Heng didn't want to answer it all at once, and he picked peaches.

However, this national teacher is also a little smart, and he even figured out the skills of answering questions in the exam in his previous life, and sure enough, the demon clan also has smart people. Thinking like this, Mu Heng became more cautious, this guy in front of him is not easy to deceive.

Then the formation was transformed for the fourth time, and five more questions appeared.

Mu Heng quickly browsed the next questions, picked the first and third questions, and entered the answers. Similar to the last time, except that the two formations were transformed at the same time.

When the time came, the formation was back to normal.

Next, Mu Heng slowly tried to continue to solve the three problems at the same time, and tried several times, the scene was similar, and there were no other changes.

I don't know how many times it was repeated, Mu Heng's face showed some tiredness, and some fine sweat oozed from his forehead.

"Childe doesn't have to be in a hurry, it's already good to be able to solve the third question." The national teacher also understood that it was indeed not easy to solve the five formations at the same time, and reminded Mu Heng to pay attention to rest.