When Li Sucai placed the compound nine-palace chart with eighty-one grids in front of Fei Xinran, the little girl looked at this strange grid with her eyes wide and curious, and the nine-palace chart with some numbers seemed to attract her. Li Sucai whispered how to play this game, telling Fei Xinran that the numbers from 1 to 9 in each row and column cannot be repeated, and the rules of this "Sudoku" nine-palace chart, as well as some basic solutions such as elimination, elimination, remainder method, triplet deletion method, etc., began to fill in the numbers on the space of the nine-palace chart, when Li Sucai filled in a few numbers while thinking, she found that Fei Xinran was also fiddling with the plastic three-dimensional number cards placed next to her, because she was worried that the child would not be able to tell, So Li Sucai deliberately took some number cards and put them in Fei Xinran's hand. When Li Sucai put the pen on a grid and thought about what number should be filled in this grid, he found that Fei Xinran held a number 5 in his hand, Li Sucai thought about it again and found that this grid should really fill in 5, Li Sucai was very happy, tried a few more times, and Fei Xinran answered it correctly, and the puzzle was solved in a few minutes. In addition to being surprised, Li Sucai made a more difficult one for Fei Xinran, and it was quickly solved.

In the end, Li Sucai decided to come up with the most difficult "Sudoku" puzzle brought today, which is said to take a mathematician three months to solve using a special program, and is the most difficult "Sudoku" problem in the world today. Looking at this puzzle, Fei Xinran's speed of filling in the blanks slowed down significantly, but she was still taking out the numbers little by little, Li Sucai then filled in the grid with a pen, more than 30 minutes later, this question was finally completed, Li Sucai took out the answer she brought and checked it, it was actually the same, she happily picked up Fei Xinran, and raised it high above her head, Zhang Xiaoqian, who had been watching from the sidelines, was also very happy, and was busy helping Li Sucai and her daughter, afraid that they would accidentally fall. Li Sucai put Fei Xinran back on the bed and said to Zhang Xiaoqian excitedly: "Great, I want to tell Fei Meng and Gu Liangfeng about this immediately, they will be very happy, this question was given to me by Professor Gu Liang." After saying that, Li Sucai took his leave and left Fei Meng's house.

As 2003 approached, several of Gu Guoqiang's companies were running better and better, and capital was accumulating rapidly, and another new technology company was also selling some by-products of the new technology developed by Fei Meng from time to time, such as selling an accessory to a high-efficiency solid-state laser weapon, the thermal concentrating energy cooler technology, to an air-conditioning manufacturing company, and selling the formula of anti-carcinogenesis drugs discovered during the development of anti-aging gene drugs to a biopharmaceutical company at a high price and obtaining part of the company's equity. The source code of the intelligent fuzzy control technology calculated in real combat by Superstring 2' was sold to a scientist who was competing for academician of the Academy of Engineering, and so on. In addition to the necessary retention, the rapidly accumulated funds were transferred to several accounts set up by Fei Meng for Fei Meng's purchase of necessary materials.

In addition to being busy with the company's business, Gu Guoqiang and Chen Fangyu also have to be on guard at all times Sato Hongsuke, the information from Tong Jiwu and Zhao Yanjun shows that Sato is in this city, but it is not easy to find someone in this city with a population of more than 20 million, let alone a person who is very good at hiding. Gu Guoqiang and Chen Fangyu set up their new home outside the North Second Ring Road, and they also knew that the busiest place was the safest, even if they were followed by Sato's people and knew where they lived, they didn't dare to act rashly. Both of them have started to take anti-aging drugs, and the production of Feimeng's anti-aging gene drugs is constantly increasing, and they have been able to supply the weekly doses that their two "giants" need in a timely manner, and the drugs themselves have also improved to only need to be taken once a week. Tong Jiwu also kept an eye on the people who were tracking Gu Guoqiang, but the two people who followed Gu Guoqiang never had direct contact with Sato Hongsuke, and they didn't even make a phone call, so Tong Jiwu never found Sato's traces, this fox hid his tail very well, but Tong Jiwu sent someone to wait patiently for Sato's appearance, he knew that it was useless to catch a small tail, and he would only startle the snake.

Li Gang followed Sato's advice, and never talked about the transaction when he contacted Li Kang, only occasionally used the code words they had discussed to understand the progress, and urged Li Kang to act quickly, time was running out.

Tong Jiwu has paid attention to the contact between internal personnel and the outside since he was allowed to monitor information below the second level by Fei Meng, and most of the external phone calls and emails, short messages, etc. are fine, but he found that in the last few conversations between Li Kang and his father, there was a word "leech" that made Tong Jiwu puzzled, he never understood what this meant, he knew that leeches are also called grasshoppers, which are bloodsucking insects, and are said to have high medicinal value, but Li Gang asked a few times whether "leeches" have grown up, What does that mean? At this time, Fei Meng asked him to go over to discuss the internal structure and division of responsibilities of the security department carefully on the information terminal, so Tong Jiwu got up and went to Fei Meng's office.

In the evening, Zhang Xiaoqian came to Fei Meng's office, she wanted to find Fei Meng to go outside to breathe the fresh air in the mountains, since she and Professor Gu Liang watched the surrounding scenery on the mountain opposite the station, Zhang Xiaoqian has regarded this as a leisure activity, often go there with Fei Meng, where a large high-rise building has been built with a top floor pavilion, Zhang Xiaoqian also gave a name "Tianyu Pavilion", for people to rest, fitness, entertainment.

Zhang Xiaoqian entered the office and found that Fei Meng was talking to Tong Jiwu about things, and did not disturb them, just sat on the sofa not far away and waited for them to finish their business. Tong Jiwu saw that Zhang Xiaoqian came in, and knew that there was no need to avoid anything, so he continued the topic just now under Fei Meng's signal, they had finished discussing the matter, Tong Jiwu was saying that he didn't know why Li Kang and his son mentioned the word "leech" several times, which is an uncommon word.

While listening to what Tong Jiwu said, Fei Meng took a drink for Xiaoqian and motioned for her to wait a little longer. Zhang Xiaoqian was also very interested when she heard Tong Jiwu talk about leeches, and said: "Leeches are good things, folk call them locusts and turtles, our traditional Chinese medicine calls them Huang Qi, and Li Kangti what does it do?" ”

Tong Jiwu said worriedly: "I can't figure it out, but I think there are some problems, so I talked to Fei Meng about this, I'm guessing if it's a code word, but what does it mean?" ”