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The Olympiad Mathematics classroom is a full 600 meters away from the training ground, and there is a howling tower several dozen meters high in between. How can it be hit?

But the testimonies of the twelve training dummies whose heads had been smashed off and Dhaka and several others told them that it was all true.

The puzzled apprentices could only look at Lin En, waiting for his answer.

"It's very simple. All we have to do is know all the data and calculate them," Lynn said with a smile.

During the time he was a professor, he had already used his intelligent brain to record every location in Yieta College, so he had clear information about the location of each training dummy. He only needed to construct the corresponding parabolic trajectory equation and then make fine adjustments based on interference factors such as wind speed.

"For the same attack, I can also replace it with fireball, pyroblast or even more powerful magic!" Lynn added.

Alok and the others couldn't help but shrink their necks. No one wanted to be walking one day and a huge fireball fell from the sky and hit them on the head!

This is so horrible that I don’t even know how I died!

"Professor Lin, is this the magic technique you developed this week?" Tik, who had been listening, asked in surprise.

"You could say that." Lin En shrugged. He was just wondering how to explain why he had taken a week off for no apparent reason.

"Professor, when can we learn this kind of magic?" Debra raised her hand high and asked curiously.

“Since you want to learn so much, I will organize an exam in Olympiad Mathematics at the end of this month. If someone can answer all the questions correctly, I will make an exception and teach him this improved magic, and even allow him to apply for graduation early.” Lin En made promises to the apprentices.

However, he did not mean to deceive. He did not expect these wizard apprentices to master any profound mathematical knowledge. As long as they could learn most of the knowledge in elementary and junior high school, they could apply for graduation.

After all, after becoming a formal wizard, you can continue your studies slowly.

In fact, this exam is also to facilitate Johnny's promotion. After all, she has become an official wizard now, so it is better to obtain the status as soon as possible.

Under the dual stimulation of improving magic and applying for graduation, the wizard apprentices burst out with unimaginable enthusiasm, and each one was more serious than the other when listening to the class.

Pierce was even more excited. Lynn's promise was undoubtedly the only chance for someone with mediocre talent like him to be promoted to a formal wizard.

"Next, we will continue to explain the relevant content of the plane rectangular coordinate system...they are all very basic knowledge." Lin En stretched out his hand, drew a cross in the air with magic, and began to talk incessantly.

After the Mathematical Olympiad class, Alok and the others either pondered or walked out of the classroom in bewilderment, their minds full of so-called absolute values, the first quadrant, the second quadrant, the X-axis, the Y-axis, from this point to that point…

Peirce glanced at the contents of his notes and felt as if he understood them, but also as if he did not fully understand them. He planned to think about them carefully after returning home.

"Sir Tik, please stay..." After packing up the teaching aids, Lin En called out to Tik who was about to leave.

"Professor Lin, what's up?" Tik paused, then spoke again. "The coordinate system concept you proposed in class is very interesting. It seems that it can accurately locate any object in space. I just don't know which master or legendary wizard came up with this idea..."

Compared to the apprentices who were only busy learning superficial knowledge, Tik was very clear about how important this thing was. He guessed that Lin En was able to accurately hit the dummies from a distance of hundreds of meters, and even bypass the entire [Howling Tower], and he must have used this knowledge.

"That's an idea proposed by a master named Descartes." Lynn smiled and replied casually.

"Descartes...it would be great if I could have the opportunity to meet these masters who have researched mysterious mathematics..." Tik said with emotion. The more he came into contact with it, the more he was surprised at the profundity of this subject.

"Maybe there will be a chance in the future!" Lin En responded with a smile, and then straightened his face and thanked him. "I heard from Luo Er before that you have been helping me with the patent application for the aerospace airship, and I haven't had time to thank you yet."

"It's just a piece of cake. I can't sit through all these Olympiad classes for nothing." Tik laughed. "According to the time, they should be here soon."

After a few polite words, Lin En took the opportunity to ask about alchemy. "I once heard a scholar in the [Secret Law Society] say that some wizards can rely on a certain alchemical formation to improve their strength and break through the upper limit of their power... I wonder if this is true?"

Hearing this, Tik frowned slightly, but still explained.

"Alchemy can indeed do something similar, but few people in the wizarding world do this now."

Tik spoke concisely and did not intend to explain in detail. A hundred years ago, when the management of the wizarding land was loose, the means of promotion of each school could only be described as varied, which caused many unwanted tragedies.

This also involves a scandal that the Wizard Council is reluctant to mention... and it also involves the evil wizard Merck... Tik doesn't want to mention this kind of knowledge too much.

Lin En also noticed this, so he changed the subject and asked about the arrangement and cracking of the alchemy formation.

This time, Tik didn't hide it anymore and explained it to Lin En very patiently.

The two of them chatted all the way to the professor's lounge. When Tik saw the silver-gray-haired witch standing at the door waiting, a smile broke out on his face.

"I'd better go back alone, Professor Lin En..." Tik raised his eyebrows and said jokingly.

As soon as Lin En saw Tik's expression, he knew that the other party must have misunderstood, but before he could explain, Tik turned around and left tactfully.

Lynn shook her head, opened the room, and invited the witch in before asking.

"Johnny, after yesterday's promotion, are you feeling well?"

The silver-gray-haired witch shook her head and looked at Lin En in confusion. "Why do you ask? Is there something wrong?"

"No, there's nothing wrong. I'm just asking." Lynn shook his head. It seemed that the potion Johnny took was not strong enough to make the Eye of Death appear in his sea of ​​consciousness.

"Next, let's get down to business. We only have two hours!" Lin En looked at the witch and urged.

Chapter 117: Bloody Thorn Promotion Ceremony

Under Lin's constant urging, Johnny nodded, quickly took out the notebook in his arms, turned to the latest page, pointed at the question on it and asked, "Professor, I don't quite understand the plane rectangular coordinate system you talked about today...especially this question..."

"If you want to determine the distance between two coordinate points, you have to use the Pythagorean theorem mentioned earlier. You can mark the difference between the horizontal and vertical coordinates on the coordinate axis, and then connect them with a line. This will turn them into two right triangles put together, so it's back to the problem of geometry..." Lynn explained to Johnny the idea of ​​solving the problem in a simple and easy-to-understand way.

The so-called doing serious work naturally means giving special treatment!

After all, Lynn had promised before that as long as the candidate could pass the exam, he would apply for graduation on behalf of the candidate in the name of a professor. In order to prevent too many people from passing the exam and the excessive number of applicants being rejected by the parliament, the exam content should of course be as difficult as possible.

However, there is a limit to the difficulty. It is impossible to come up with some knowledge points that have not been taught before. At most, the question types will be slightly more difficult... just a little bit!

In order to ensure that Johnny can answer all the questions correctly, private tutoring is essential.

Although it is a bit unfair to other students, it is not shameful to seek tutoring from a professor.

Lynn never forbad other apprentices from asking him questions, it was just that Johnny asked more and deeper questions.

Two hours passed in a flash. Johnny closed the notebook in his hand, looked up at Lin En, and said with a smile: "Thank you for your guidance, professor. I have to say that you are really a great teacher!"

There was a light blush on the girl's cheeks, and she looked at Lin En in front of her with sparkling eyes, as if she was completely immersed in the academic exchange just now!

"I just came into contact with Olympiad mathematics earlier than you." Lin En shook his head.

At the latest, it was only half a year earlier. Johnny rolled his eyes at him, and he finally understood why the eyes of those students in ordinary classes were filled with envy, jealousy and hatred when they looked at them. This gap in talent was simply despairing.

"Then I won't bother you anymore, Professor. See you tomorrow." Johnny put away his notes filled with answers and problem-solving ideas and prepared to leave.

Lin En stood up and walked the witch to the door. Before leaving, the silver-gray-haired witch glanced at the knuckles of Lin En's left hand that opened the door, and said with a little emotion.

"I didn't expect the teacher would give you even this."

Lynn paused, then followed Johnny's gaze and looked down. On the ring finger of his left hand was the [Ring of the Faceless Man] from Radak.

Kelu is also a member of the Faceless Men...

Lin En was very surprised. This was totally beyond his expectations, but he remained calm. "Teacher, do you care about this ring? Do you know how to use it?"

Johnny shook her head. She only knew that Kelu had been wearing this ring since he accepted her as his apprentice. She guessed that it must be a very powerful alchemical tool, but it had never been used in front of her.

After the silver-gray-haired witch left, Lin En closed the door and looked at the [Ring of the Faceless Man] in his hand.

Could it be that my identity was revealed by Kelu?

But wasn’t this guy captured by the Vatican and taken to the Holy City?

It would be good enough if you were not tortured or burned at the stake. The possibility of escape is very slim.

Or maybe before Kelu was arrested by the church, he had mentioned himself to someone.

[It's been a long time since No. 4 came, right? ]

Lin En suddenly thought of what one of them had said when he attended the Faceless Men's gathering. Could it be that this number four was referring to his mentor Kelu?

……

The next evening, in the southern part of the Yieta Harbor, in front of a luxurious manor, a convoy of three vehicles pulled by camels slowly stopped in front of the door.

Lin En, who had already disguised himself, walked out of the car in the appearance of Ladakh. He was naturally here to attend the so-called promotion ceremony.

Along with Lin En came fifteen of Radak's apprentices. Bock, Patty and the others were expectant and excited, hoping that they would be chosen this time, and thus ascend to become a noble official wizard in one step!

"Lord Ladakh, please come in!" The burly guard at the door opened the tightly closed iron gate and invited respectfully.

Lynn and a group of apprentices walked through the gate of the manor and followed a cobblestone path towards the interior of the manor.

Behind him, the burly guard had closed the iron gate again and looked at everyone with a mocking expression, but he did not notice that a dozen small, black rats quietly slipped into the manor amidst the crowd.

These rodents are naturally puppets controlled by Lin En using the psychic magic [Undead Manipulation]. Their small size does not easily attract attention. In addition, there are a few gray crows and more secretive geckos.

Although they do not have much combat power, they can serve as his eyes to observe the layout of the entire manor and the surrounding environment. If necessary, the liquid bombs they carry may also come in handy.

After passing through a long corridor, Lin En and others arrived at the banquet hall of the manor. The interior was very spacious, and a variety of exquisite delicacies and desserts were placed on the long table.

At this moment, many guests have gathered in the banquet hall. A rough estimate is that there are probably one or two hundred people. Most of them are apprentices, but there are also many formal wizards. Barbara and Hank are among them. Lynn even saw Leia, the sheriff of Yieta Harbor.

They all had smiles on their faces and were talking to each other, creating a very harmonious atmosphere.

On the stage in the center of the banquet hall, a butler in a tuxedo was dancing an elegant jazz dance, and a pretty maid was holding a silver tray, ready to serve drinks and meals to the guests at any time.

"Radak, why are you always the last one to arrive?" Hank saw Lynn coming in, walked up to him and tapped him lightly on the shoulder.

"It's better to arrive at the right time than to arrive early, isn't it?" Lynn looked around the lively scene in the banquet hall and answered casually, then lowered his voice and asked, "Are you sure North will come to this gathering?"

In the past few days, Lin En also tried to control the gray crow to find North's trace, but to no avail.

"Since he hasn't canceled the promotion ceremony, he will definitely come!" Barbara said firmly.

As soon as Barbara finished speaking, North, dressed in a gray robe, appeared in front of everyone...

Chapter 118 You are destroying the foundation of our rights!

"Welcome everyone to this gathering!" Under everyone's attention, North walked out from the passage behind the banquet hall, looked at everyone present with a gentle smile on his face.

Hank and the others looked at each other with a hint of suspicion in their eyes. They originally thought that North's inexplicable disappearance during this period was to break through and become a great wizard.

But now it seems that this is not the case, because they could not feel that obvious sense of oppression from each other, which means that North should be a three-ring wizard like them.

Realizing this, Barbara was relieved but also a little annoyed. She interrupted without caring about the occasion. "North, there are some things you should explain to us, such as where you have been these days and when you are going to fulfill your promise to us?"

Barbara's words made the atmosphere on the field become subtle. Leia and others who were invited shook the red wine in their hands and watched the excitement with interest.

The wizards of "Blood Thorns" looked at Barbara with dissatisfaction. In their opinion, no matter how big the conflict was, it should not be spoken out in such an occasion, otherwise it would make outsiders laugh at it.

However, North didn't care at all. He calmly raised the goblet in his hand, drank the bright liquid in it, and laughed. "After this promotion ceremony, I will not lose a penny of what I promised you!"

North's straightforward assurance made Barbara and Hank hesitate. They couldn't help but wonder if their guess was wrong.