In the summer, the blue sky was dotted with white clouds. The temperature in Jiangning was pleasant, and it was leisurely outside and inside the city. In the bright summer sunshine, the streets and courtyards were shaded by trees. Birds were flying among the pleasure boats on the riverbed, pedestrians were walking back and forth in the ancient city, and the restaurants and tea houses were filled with the sounds of entertainers telling stories and singing. The aroma of tea mixed with the voices of friends gathered and chatted, becoming a part of the seasonal picture.
It was afternoon, and there was the fragrance of tea in the courtyard on the side of the city. The shade of the sycamore tree dyed the black and white chess pieces on the chessboard mottled. It was also in such a courtyard that the young man's voice rang out.
"… Mencius once said, the people of the region do not use the borders of the territory, the country does not use the dangers of the mountains and rivers, and the world does not use the benefits of war to conquer. Those who gain a just cause receive much support, those who lose a just cause receive little support. The words of the saints are indeed true. However, since ancient times, those who gain a lot of support may not necessarily gain a just cause. Those who lose a just cause and those who receive little support often think of themselves as people who gain a just cause. What is the meaning of a just cause … Confucius once said, the desire to return home is the thief of virtue.
From this, we can see … "The young man was not tall, and his face still looked childish. He was about eleven or twelve years old, but he wore a long white robe and had a silk scarf on his head. He looked like a mature adult. In fact, at this time, most children did not see much of the world when they were eleven or twelve years old. They always combed their hair into a bun with two horns. Because it looked like horns, it was called "Zongjiao" in ancient times. There was also a sentence in the Book of Poetry, "Banquet of Zongjiao, talk and laughter."
However, there were always different kinds of things. At this time, children usually had a ceremony between fifteen and twenty years old to show that they were of age. However, if it was a peasant family, there were usually thirteen or fourteen years old who got married and had children. Many people had to bear the burden of the family before fifteen. If it was a child from the city, after learning a little more, they would often think of themselves as a scholar. At this time, the society was full of literature, some children and teenagers who could write a few poems would often dress up in scholarly clothes and silk scarves. The little adults were also full of vigor and vitality. As long as they dressed up a little more simply, no one would say anything. For example, fifteen or sixteen year old youngsters who were full of eloquence, talking about the state of the country, and accompanying each other to visit prostitutes, that was nothing out of the ordinary.
The young man speaking in the courtyard was one of Ning Yi's disciples, Zhou Junwu. In the past, he still had the appearance of a lively child, but in the past year, he seemed to have matured. Of course, there was a limit to how mature a twelve-year-old child could be. But the main thing was that he had some ideas in his heart and was no longer fooling around like he used to, so he felt that he had "grown up". His appearance was delicate and pretty, and at this moment, he looked like a little scholar, which made him look a little heroic.
At this moment, he stood there and spoke. As he spoke, he thought and organized his words. Naturally, it was to answer the questions of the elders in the courtyard. In the shade of the trees, Qin Siyuan and Kang Xian had just finished a game of chess. He casually asked a few questions, and Qin Siyuan gave a discourse on the "debate of the great Dao". On the side of the courtyard, there was also a young girl sitting on a low stool watching this scene. The girl was not very old, and her hair was still combed into two buns. She wore a pink and white summer dress, which accentuated her slender waist and small feet in yellow and white embroidered shoes. The girl rested her chin on her hands and smiled as she watched this scene. There was a round fan in her hand. Because the weather was not hot, she only occasionally fanned the teapot that was boiling water on the small stove beside her. This was naturally the young princess, Zhou Pei.
It had been several days since Ning Yi left Jiangning. Although this pair of young siblings were still in Yushan Academy, they had basically separated themselves from their studies there. As in the past, their studies were basically controlled by Kang Xian. Naturally, there were other masters in the prince's mansion or the prince's son-in-law's mansion teaching them on their behalf. Zhou Pei had not yet reached marriageable age, but she was, after all, "old". As for the progress of her studies, it was up to her liking. The requirements were not strict, but there were still considerable requirements for little Junwu.
Of course, although he was often bullied by his powerful sister, Zhou Junwu's brain was still very smart. Although his studies were not top-notch, he was still at an average level and not too bad.
"The debate of the great Dao" was a topic that was equivalent to an essential oil. This topic was not set by Qin Siyuan and Kang Xian, but by the youth based on a few words that Kang Xian had said. After that, the two elders listened and looked at each other and smiled.
"Beautiful flowers," said one.
"Big but useless," said the other.
The evaluation was not good, but as a topic that tested the youth's ability to think independently, he finally passed. Little Junwu also knew the two grandpas' personalities, so he touched his ears and smiled. In fact, after his master went to Suzhou and Hangzhou, the grandfather of the Qin family was also going to leave for the capital. Today, he came over and saw that some things had been packed. The son-in-law had been playing chess these days, probably preparing to see him off.
"After your master left, he went to study with several masters in the prince's mansion. I'm afraid the progress will be different from in Yushan Academy. Can you keep up with your studies? Do you understand? "Qin Siyuan smiled.
"I understand." Zhou Junwu saluted and smiled. "Actually, Teacher Zhang and the others have already tested the students' progress. They also continued to talk about the following lessons and even repeated the previous ones. It's just that even after the lessons, when the masters talk about it, the students always feel that they already know a lot. In the past, when Master taught, he always talked about a lot of irrelevant things. But now that I think about it, often when he talked about the previous lessons, he had already talked about the later ones. So, although there are many things that I haven't learned, when the masters talk about it, I feel very familiar and easy to understand. It's just that … hehe, it's a bit boring. "
Hearing this, the two old men looked at each other and smiled. Then, they also put on a serious face. Kang Xian said, "Don't be complacent. Master Zhang and the others are also great scholars of today, and they are quite knowledgeable. Everyone's teaching methods are different. Although you feel that you understand a little, you may not be able to learn the true meaning of Master Zhang's knowledge. Although you understand what they say, the more it is like this, the more you have to think carefully. "
Jun Wu nodded respectfully. "That's right. Master said the same thing before he left. He said that every teacher has their own skills, and as a student, we should learn to think. We should learn everything that's good. As for what's good, we'll have to test it out in practice. You can think however you want, but you can't be arrogant. "
"It's really hard to find a teacher like Liheng …" Qin Siyuan couldn't help laughing. Kang Xian shook his head impatiently. Zhou Junwu, on the other hand, was a little proud of Master Zhang. The young princess, who was resting her chin on her hand, smiled and narrowed her eyes. It seemed that she was thinking about something. Qin Siyuan then tested Jun Wu's understanding of the Four Classics and chatted with Kang Xian for a while. They made a pot of tea and were about to start a new game of chess. Then, they talked about Ning Yi again.
"Before Liheng left Jiangning, he told him about Shangjing, but it seems that Liheng still has some concerns. It's always hard to understand what he's thinking. In the past, he only talked about doing things, and never about saving the country and the people. In my opinion, it seems that he has some concerns about the Tao, so he's very cautious. "
Kang Xian nodded and said, "He's very resourceful. It's just that in the past, I can see that he doesn't think much of the secular officialdom. If he can think it through and help you, you won't have to face so many obstacles when you do things in the capital. "
Qin Siyuan shook his head slightly. "Li Heng has always been steady when he does things. However, looking at his style, his goals are often radical and thorough. Yet, he himself has this kind of ability. I'm afraid he also understands in his heart. Before he left, he told me that if he really wants to do something, even he doesn't know if it's a good thing or a bad thing. Recently, I've been thinking about what will happen if we ally with the Jin Kingdom to fight against the Liao Kingdom. I don't know. When the Jin Kingdom grows, who knows if it will become another Liao Kingdom. Sometimes, good intentions don't necessarily lead to good things. "
"At least we have a chance. When the Jin Kingdom and the Liao Kingdom fight, we just need to seize the opportunity and win a few battles to recover our country. But if we can't win, it won't be your problem alone. "
"If that's the case … the country will perish …" Qin Siyuan frowned and thought of this sentence. Actually, if a commoner said this, it would be a bit rebellious, but there was no harm here. Kang Xian also frowned. Qin Siyuan lowered his voice and said, "Actually, I think this is what Liheng is worried about."
"Hmm?"
"What he thinks has always been like his style of doing things, simple and direct. When he said this, it seemed like a joke, but in fact, it might not be. Perhaps in his eyes, our dynasty is so weak that if there really comes a day when we can't grasp such an opportunity, then our country … should perish … "
"How can he …"
"There's already a chance. This time in Bianjing, I will naturally cooperate with Prime Minister Li and let him reorganize the military affairs. But whether I can do it well or not, I'm afraid there are still many difficulties. Oh, since ancient times, even small changes in the world have countless difficulties. Those who want to carry out big changes, eight or nine out of ten will not have a place to go. He said, 'Your future is uncertain, I don't want to follow you.' Haha, although it's a joke, I'm afraid Liheng has thought about these things clearly. He has such an opinion, and I'm afraid he has thought about how to do it, how to seize this opportunity, and the difficulties involved. Maybe he thinks too hard, and has prejudice in his heart, so he stops at the sight of it. In my opinion, this is the reason why he has been evading. "
"Even if it's hard, someone has to do it."
"The more intense the matter, the more changes, the harder it is to know the outcome. Liheng probably feels that his style of doing things is too intense. After all, he has never entered the political arena, and just based on imagination, he is afraid that he will be too stubborn in the future, so he has the idea of living in seclusion. I have been thinking about this for the past few days, and this is the only reason. "
"Oh, you haven't done it, but you think you understand, aren't you too arrogant?" Kang Xian said with a smile.
"If it was someone else, I would say the same. In their early twenties, even if they think highly of themselves, they would only be able to become a county magistrate in the future. But as for Liheng, it's hard for me to say. It's just that during the few incidents in Jiangning, he has been shrewd and ruthless. Among the younger generation, I have never seen such a person. He is born with the ability to read people's minds, and he can control them to achieve his goals. In troubled times, this person would definitely be an ambitious and ruthless person. It's just that he is aware of his own abilities, and he has restraint. This is what I truly admire about him. For example, when I invited him to the capital, his heart might not really reject it, but on the one hand, he is aware of the difficulties in the future, and on the other hand, he is aware of his own methods. Because he is afraid of doing something bad, he is restrained. In my opinion, this is not cowardice, but it only makes me admire him even more. "
The old man smiled again. "However, I am not worried about whether he will come out or not. With this ability, he will come out sooner or later. Let's wait for him to think things through first."
As they spoke, they did not avoid Zhou Junwu, who was sitting next to them. After all, he was different from ordinary students. If it was an ordinary student, respecting their teacher was the most important thing, and they would not talk about his teacher in front of him. But Jun Wu was the young prince of Prince Kang's Mansion. Although the Wu dynasty was strict with grandmasters, on the other hand, Zhou Junwu was Kang Xian's disciple. Kang Xian's wife, Princess Cheng, owned a large number of royal properties. Although Kang Xian and Zhou Xuan had their own children and grandchildren, in order to pass on these properties in the future, they needed the approval of the higher-ups. In fact, Jun Wu was to be one of the managers. After all, Ning Yi was too difficult to grasp. If anything happened in the future, the two's comments would become a major reference for Jun Wu.
Of course, it was also because it was a positive comment that they talked about it. As they talked, Jun Wu frowned and looked a little hesitant. When they finished talking, he smiled. Qin Siyuan looked at him with a smile. "Jun Wu just talked about the debate on the Great Path. Some of it was Liheng's opinion, right?"
Jun Wu hesitated for a moment, then nodded. "That's what Master said, but … he seemed to want to say something about it."
"Haha, your master was afraid that if he said too much, he would scare you. I'm afraid that he would say that the Great Path is the one that is useful after using it, and it's useless to talk about it. But, Junwu, I don't think you've learned much from Li Heng. Instead, you've learned a lot about how to think and look at things. You think that Master Zhang and the others have become easier to understand because Liheng mentioned it, but the main reason is that you've become better at thinking. "
Jun Wu nodded vigorously.
"But it's not necessarily good to learn to think too early." Qin Siyuan smiled. "Actually, people who study and learn how to read and write are ultimately broadening their horizons and learning how to think. As long as he truly learned how to think, he would be able to draw inferences about other things from one instance and achieve twice the result with half the effort. Your master has always taught you to think as early as possible, so he told you stories to guide you to use your brains. That way, you'll learn faster. But you're too young and you don't have enough experience. If you think too much, you'll be biased. In the end, you'll become arrogant and think that Master Zhang can't compare with Teacher Ning. Then, you'll think that Master Zhang's words don't make sense. You might even start to think that the ancient sages' writings are wrong … Once you have your own ideas, you'll become arrogant and conceited! Jun Wu, remember what I've said. "
Qin Siyuan had always been kind and generous to his juniors. When Kang Xian said that Jun Wu's thesis was' too grand to be carried out ', Qin Siyuan had only said that it was' splendid and splendid '. However, as he spoke, his expression began to turn serious. In the end, he even seemed a little stern. Jun Wu sat up straight and listened to his master's instructions. After a while, Qin Siyuan's expression relaxed.
"So, generally speaking, when a master teaches his disciples, he only asks you to remember at first. When you're older and you're able to see things, he'll let you think about it. That way, you'll have a more solid foundation. Of course, I'm not saying that your master's teachings are wrong. Just from what he told you, I can tell that he values it very much. He's trying to control it, but you're still a child. Grandpa Qin is going to the capital soon, so I want to remind you again. It's good that you can think, but like your master said, don't be arrogant. Even if you don't agree with what others say, even if you think it's trite, you must remember it. As long as you remember it, when you grow up, you'll verify it one by one. You'll find out why others think the way they do, and the reason behind it. By doing so, you'll find the benefits. "
The teenager bowed solemnly. "Jun Wu, I'll remember."
"That's good." Qin Siyuan smiled. "Although you and Liheng studied the Four Books and Five Classics, I'm afraid that wasn't the main purpose. How about the study of things? Do you think it's useful, Jun Wu? You should have some ideas about it now. "
"It's useful, it's useful." Jun Wu had always been lively. When he was being tested and listening to the teachings, he was very enthusiastic. But when it came to the study of things, the boy's face suddenly lit up. He nodded again and again. "The study of things is, the study of things is …"
He seemed to want to promote this concept to others, but it was difficult for him to organize a shocking speech. Qin Siyuan smiled. "Oh?"
"Well, the study of things is … Master once said that the foundation of physics … Oh, the study of things is to make bold guesses."
"Guesses?"
"Yes." Jun Wu nodded. "No matter what you see, you can guess why it is, and then come up with a formula or theory that can be used. But the theory must be applicable to everyone in the world. If there's one thing that doesn't match, you have to overturn the guess and continue guessing …"
"It's just guessing?" Qin Siyuan frowned as he tried to understand these things.
"Yes, usually we use the method of deduction, but Master said that we must have imagination. If there's something that you don't understand, you have to guess first if you want to understand it. Well, Master said that there are some basic principles. For example, you can draw a straight line between any two points, and the straight line can be extended at will … "
Jun Wu began to talk about the basics of the study of things he had learned. It was obvious that the boy was like a missionary, trying to promote the study of things to the Qin family through his speech. The old man listened to the simple principles and said, "Do we still need to guess?"
"This is the basic composition, Grandpa Qin. The study of things can't be taken for granted. Although the theory can be guessed, the verification process must be rigorous, step by step, and every step must be absolutely accurate …" Jun Wu tried hard to promote the concepts he learned from Ning Yi. "These things can be very complicated step by step. Grandpa Qin, this is how everything in the world came to be. After learning it, we can know why we can weigh things. Why can a lever conduct force … Force. Well, we can put a stone here as a fulcrum and press it down, and that stone will rise. We can calculate how high it will rise. Then, we can put a gear there and see how it will move. Then, we can put another gear behind the gear, and then we can add a lever. Just like a waterwheel or a windmill, we can make very complicated things … "
"Don't we already have a waterwheel or a windmill?"
"But it can be more complicated. Grandpa Qin, you don't know this, but Master once designed a very simple thing for us. We start with a waterwheel, add a lever, and a gear. Then, we can make a printing board. When the board rises, a brush will apply ink to it, and the board will press down to print a page of a book. When the board rises, another claw will pull the printed page away, and another piece of paper will be pulled over. Then, we can print again … and again … and again. Master said this is called an assembly line … "
The little boy was not very eloquent after all, and his explanation was too complicated. He gesticulated with joy. "Of course, we also have to consider the toughness of the paper, the uniformity of the ink, and the wear and tear of the machine. But all of these can be calculated. Even if it's paper, as long as we understand why it can be called paper, we can make better paper. Master said it's because of plant fibers, but we don't know much about it yet. Oh, we can also calculate the quality of iron. Grandpa Qin, do you know that the reason why iron is hard and brittle is that there is something in it that can be burned? That's carbon. The less carbon there is, the more resilient the iron will be, which means it won't break or rust easily … "
Qin Siyuan had already turned to look at Kang Xian. He didn't ask too much about Ning Yi's theory, and he used to think otherwise. But now, he gradually got an idea. Kang Xian must know what Jun Wu had learned from Ning Yi. The two old men looked at each other, and Qin Siyuan said, "It's a bold guess, but it has to be the most serious deduction, and every step has to be …"
Kang Xian nodded. "I don't know much about the details yet, but I've asked someone to write down some of what Liheng and Jun Wu said and think about it. There's a booklet here, and I'll have someone bring it to you tomorrow. To be honest, it's just a guess and deduction, and it's broad and profound if you really do it. But … I'm afraid there might be some trouble. You can help me think about it. "
Qin Siyuan nodded. Jun Wu didn't understand what "trouble" meant, but he was sure that it would be troublesome to complete the deduction, so he was still talking excitedly.
"Grandpa Qin, have you ever wondered why a kite can fly in the sky? Why Kongming lanterns can fly? It's because when the wind blows, the kite will tilt at an angle, and that angle will split the force, so that one part goes backward and the other goes upward. As long as the wind keeps blowing, the kite will keep moving upward. As long as we can make a big wing and keep it moving forward, we can fly at a certain speed … Of course, Master said that this needs to be done with tougher materials. As long as we can figure out how to use bellows, we can make better bellows, higher temperatures, better iron, and more durable cloth. Anyway, we've been working on it lately. As long as we have a large surface area and a high speed, we can fly … I'm sure I can make a big kite that can fly … "
There was a look of fanaticism in his eyes as he said that. The two old men were thinking about what he was saying, so they didn't notice his expression. Then, Jun Wu shook his head. "Of course, that's a long time in the future. It'll take a long time to develop basic industries …" He repeated what Ning Yi had said.
"Anyway, when Master left, he asked us to think about a few things. First, we now know that there is a force in everything, but … where does this force come from … "He jumped on the ground." When we jump up, we immediately fall down. Why do we fall down? Why does the apple fall down? Why does the earth pull us? Why don't we float up … "
"Did Liheng ask you to think about that too?"
"Yes, it's just a thought. Of course we have to think about it. I also find it strange now … The second question is, why does the mast always disappear when we are at the beach?" He shuddered. "Grandpa, it's scary. Everything we see is straight. If the mast is always the last to disappear, it means …" Jun Wu swallowed and took out a piece of paper.
Jun Wu gulped and took out a piece of paper. His eyes were filled with a strange and terrifying light. He tilted the paper to form a small arch bridge and cut it in the middle. "The high side is the ground, and the low side is the sea. Grandpa, our world has a slope. It's like a circle that slides down to 90 degrees. Grandpa, what do you think it is? I think there's a big hole on the other side of the sea, like a funnel, but the seawater doesn't flow into the hole. That reminds me of Master's previous question. Why is there a force holding us back? Grandpa, I don't know why, but it's the force that's holding us back that keeps us from falling … But why is the world like this? Master must be thinking about these reasons, that's why he asked us …" Jun Wu gulped and took out a piece of paper with a terrifying look in his eyes.
The world was slanted, and there was a big hole on the other side of the sea. Qin Siyuan and Kang Xian couldn't believe it. But when they thought about the theory that the mast of the ship was the last to disappear, it was really scary …
Jun Wu shook his head. "But Master said that we were just playing around with these two questions. He probably didn't want to scare us. He didn't know that we had figured it out so quickly … Anyway, Master's third question is the most important."
Qin Siyuan was also interested. "What did Liheng ask?"
Jun Wu stood up and walked to the small stove that was boiling water for tea. He squatted down and looked at it for a while. "Master said that one of the most important ways to develop physics … uh, physics, is in this teapot …"
"Teapot?"
"Yes." The little boy nodded and looked back at the two grandpas. "Master forgot that he mentioned it to us before … Grandpa Qin, if we plug the mouth of the teapot and press the lid to stop the teapot from releasing air, can we hold it down?"
"We have to release air eventually. I'm afraid we won't be able to hold it down."
"Qi will push the lid open, and there will be power here. If this teapot is a little bigger, the power will be even greater … Master taught us that as long as we use levers, gears, and things like that, we can always transfer this force out. As long as we can make this kind of thing, it will be just like what Master said …"
The little boy jumped up and turned back with a smile. "Master once said that there are times when human strength is limited, and there are times when animal strength is limited. No matter what kind of horse you have, a carriage can only run so fast, because no matter how powerful a horse is, it is still a horse. But with levers and gears, a machine is different. A waterwheel is more powerful than a horse, but the waterwheel can't move. The first goal of physics research is to create a portable power source! "
Words like machines, portable power source, and so on were basically Ning Yi's way of talking. Having been here for so long, Ning Yi had basically become a part of this era. However, whenever he talked about something new, he would ignore the grammar of this era. He wouldn't force anyone to understand what he was saying. Jun Wu had been with him for a long time, so he had memorized all of Ning Yi's sayings and used them as guidelines for learning Geomancy. Because he remembered all this, he soon understood what Ning Yi was talking about.
"One day, I'll be able to fly to the sky …"
The little boy looked at the teapot and murmured. A moment later, the girl sitting by the small stove raised her fan and hit him on the forehead.
"Alright, you haven't learned mathematics yet. Stop thinking about this. You want to fly to the sky? Do you want to die? Master scolded you a few days ago, saying it's dangerous. Don't think about it anymore! "
"Woo." The little boy covered his forehead, looked at his sister bitterly, and muttered, "This is my dream …"
It was hard to say whether the boy had woken up or not. As for the nature of physics, Qin Siyuan and Kang Xian felt that it was unheard of, but it made sense. On the other hand, they thought it was ridiculous, mainly because of Jun Wu's inference that the earth was shaped like a funnel. Soon after, Qin Siyuan said slowly, "If you see someone riding a horse on the grassland, it doesn't matter which direction you go. Why is that? If you think about it this way, is the earth round? "
He thought for a while and then laughed. "Nonsense, nonsense. But this idea is quite interesting. Haha."
Kang Xian was also stunned for a while, then laughed. "Interesting, interesting. If it's round, what does the other side of the earth look like? Doesn't everyone fall into it? Are we all going to live upside down? "
Jun Wu was quite vexed. The two laughed for a while, then their expressions became strange. Then, they changed the topic. They were both very intelligent people. Although they didn't understand the logic of the West, they knew that people thought the same way. They could instantly get used to giving conditions, theories, and making strict inferences. They didn't dare to think about it for a while.
"I heard Jun Wu say 'we' and 'we'. It seems that other than you and Xiao Pei, there are other people studying physics?"
"That's right." Jun Wu nodded proudly. "Apart from me and my sister, there are two junior brothers in school and the youngest son of the Kaiping prefectural duke. I told him about it recently and he thought it made sense. He wants to make kites with me. Oh, right, Kang Luo also thinks that physics is interesting … So, we formed the Physics Research Party a few days ago. There are six of us now. I'm the leader! "
Zhou Pei smacked her little brother's head with her fan again, but she just smiled and didn't say anything. The two old men found it funny. The two junior brothers in school aside, the youngest son of the Kaiping prefectural duke was only ten years old. He always followed Jun Wu around and was dragged into the group. Kang Luo was Kang Xian's grandson, who was eight years old. Jun Wu was quite popular among the kids, so he immediately pulled them into the group.
"It seems that the Physics Research Party will grow very fast." Qin Siyuan nodded.
"I'm afraid Little Qi and Little Xin won't be able to escape either …" Kang Xian laughed and joked about his children. Among his grandchildren, Kang Qi was seven years old and Kang Xin was five years old. He was afraid that they wouldn't be able to escape the fate of being dragged into the Gaiwu Party …
While the two old men were joking, Jun Wu also became a little angry. He decided not to give Kang Qi and Kang Xin a chance to join the Physics Research Party. They were stupid anyway. He was very strict when it came to recruiting members. Every time he recruited someone, he would describe their future prospects in detail. It was like flying into the sky.
There would definitely be a day like that …
It was a summer afternoon. It had been about 800 years since the first vehicle that could fly in the sky had truly appeared in another period of history. The young prince turned his head to look at the teapot in the courtyard. His heart was filled with longing as he drew a large pancake.
Some things had taken root and sprouted in silence, and could no longer be erased …
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