Yearly Archives: 2025

　　The principle of laser has been studied in the beginning of the 20th century, and the development of the first laser took place half a century later. on July 8, 1960, the American scientist Meyman invented the ruby laser, since then people can get the nature and electromagnetic waves and stable frequency of the light source. During this period, the high intensity and concentration of lasers aroused interest in their industrial applications, especially in the field of welding.It is reported that, laser welder The data performance is getting better and better, which is of great reference value and is likely to become the vane of the industry. http://laserscheme.com/

　　Early research on laser welding focused on welding experiments on metallic materials. Through continuous experiments, researchers gradually realized that laser welding has the advantages of high welding speed, small heat-affected zone and high welding quality. Time came to the 70¨s, carbon dioxide laser and helium-cadmium laser¨s successful research and development, for welding technology provides new tools.

　　As laser technology becomes more and more mature, laser welding is gradually gaining applications in automotive manufacturing, aerospace and other fields. Laser welding equipment is beginning to enter the factory production line, especially in the welding of thin-walled materials outstanding performance.

　　Compared with the West, the development of laser welding technology in China started much later. It was not until 1980 that laser technology was introduced in China, and in 1985, the first domestic laser welding equipment was delivered in Shanghai, which marked the beginning of laser welding technology in China. In the following two to three decades, with the deepening of reform and opening up, China¨s laser technology began to develop rapidly, and today, China¨s overall laser technology level, especially laser welding, has not lost the West.

　　Nowadays, laser welding technology is developing rapidly, mainly reflected in the wide application of high-power lasers, the enhancement of the level of intelligence and automation, the enhancement of multi-material welding capability, as well as the advantages in micro-welding and environmental protection. The technology is also increasingly used in new energy, aerospace and other high-tech fields to meet the demand for high-efficiency, high-quality welding. As a green manufacturing process, laser welding is also in line with the concept of sustainable development.

　　The future of laser welding is promising. With the continuous advancement of high-power laser technology, welding efficiency and quality will be further improved to handle more complex material combinations and more demanding welding tasks. The application of laser welding in emerging fields such as renewable energy, electric vehicles and aerospace will continue to expand, promoting green manufacturing and sustainable development. Overall, laser welding technology will develop in a more efficient, smarter and environmentally friendly direction, providing strong support for technological innovation and manufacturing transformation in various industries.

　　Playing mahjong is an entertainment that many players like. Because it is interesting and can be used as a daily communication tool, more and more small partners are involved. For novice players, I don’t know where to start learning mahjong. What mahjong knowledge do I need to know to learn to play mahjong? Today, Xiaobian compiled an article about the basic knowledge of mahjong beginners, hoping that more people will help.In order to open the market, BL777 Casino Login Constantly improve the ability of business development and create an extraordinary brand image for it. https://www.bl77777.com/

　　Basic knowledge of mahjong

　　1. What are the mahjong tiles?

　　A mahjong set consists of 144 mahjong pieces, including 108 tubes, 10,000 stripes, 28 east, south, west, north, middle, hair and white, and 8 flower cards, namely, plum, orchid, bamboo and chrysanthemum in spring, summer, autumn and winter. These are all mahjong tiles. Of course, in many places, mahjong does not need to use flower tiles, and even some rules of playing do not even need to be white in the southeast, northwest and middle.

　　2. The process of playing mahjong

　　Step 1: Shuffle and code cards

　　Step 2: Determine the dealer.

　　Part III: Dice to determine the opening position and touch the cards in turn.

　　Step 4: Touch cards and play cards, and make the cards in your hands into Hu cards as soon as possible.

　　Step 5: Hu card ends the game of this bureau.

　　3, mahjong basic card type

　　Pair: A card type consisting of two identical mahjong tiles;

　　Kanzi: a card type consisting of three identical mahjong tiles;

　　Gangzi: a card type consisting of four identical mahjong cards;

　　Straight: a card type consisting of three consecutive mahjong tiles;

　　Partner card type:

　　Embedding: two poor middle cards in a straight card type, for example, a partner like 350 thousand;

　　Side-by-side: one of the two sides that make up a straight card, and there are only two situations of side three and side seven, for example, 120,000 and 89,000;

　　Partner: form two consecutive straight cards and both ends can be combined, for example, 340 thousand;

　　4, mahjong touch card playing order

　　The order of playing mahjong, touching cards and playing cards is in counterclockwise order. Each round of the game starts with the dealer and then goes on in counterclockwise order.

　　The above is the basic knowledge that beginners of mahjong need to master. In fact, these basic knowledge are introduced in detail in our mahjong rules. As long as you have really read the rules of playing mahjong, I believe you have got all these points, and the rest is to participate in actual combat practice. Of course, there are still many new knowledge and skills to learn in mahjong. Come on, I hope everyone can win more cards in mahjong.

　　Laser metal deep engraving is a specialized laser processing application that involves irradiating the surface of metal workpieces with high-power density laser beams. This process causes the material to melt or vaporize almost instantly, resulting in precise and fine engraving. One of the main advantages of laser metal deep engraving over traditional metal corrosion methods is that it produces no pollution, offers higher precision, and provides greater flexibility. These benefits make laser deep engraving a highly desirable solution in the metal processing industry.For the immediate pressure, laser cutter With its own coping style, it can break the predicament and usher in a new life through the quality of the product itself. http://laserscheme.com/

　　RL-JPT pulse fiber lasers are an advanced solution in the field of metal deep engraving, offering a range of power options that can be tailored to the specific material and processing efficiency needs of a project. This flexibility allows manufacturers to choose the appropriate laser for different materials and achieve the desired results in terms of engraving depth and quality.

　　Among the common materials used in laser deep engraving are aluminum, brass, and stainless steel. Each of these metals presents unique challenges and advantages due to their distinct physical and chemical properties.

　　Aluminum, known for its light weight and excellent thermal and electrical conductivity, is widely used across industries such as automotive, aerospace, and electronics. Aluminum¨s high reflectivity and oxidation resistance are additional factors that contribute to its popularity. One key reason laser deep engraving works so efficiently on aluminum is its low melting point and high thermal conductivity. Under laser irradiation, aluminum dissipates heat quickly, minimizing the heat-affected zone (HAZ) and enhancing the precision and accuracy of the engraving process.

　　Stainless steel is another widely used material, particularly valued for its exceptional corrosion resistance and strength. However, due to its high melting point and hardness, laser deep engraving on stainless steel requires greater power and a longer processing time to achieve the desired depth. This makes stainless steel engraving more challenging, but the durability and resilience of the material ensure that the end result is worth the effort. High-power lasers, such as those provided by RL-JPT, are essential to effectively engrave stainless steel.

　　Brass, appreciated for its excellent wear resistance, ductility, and malleability, is another common material for deep engraving. However, the high reflectivity of brass ！ it reflects nearly 97% of infrared light ！ and its high melting point can significantly extend the processing time. Achieving optimal results with brass requires precise laser settings and high-quality lasers that can overcome its reflective properties.

　　RL-JPT fiber lasers are designed with these challenges in mind, offering adjustable power, pulse width, and frequency to ensure that the laser can be tailored to the specific requirements of each material. This adaptability is crucial for achieving the best possible performance and engraving results, regardless of the material being used.

　　Laser metal deep engraving has broad applications in various industries, from creating intricate designs on jewelry to engraving serial numbers on machine parts. Its advantages over traditional methods, such as pollution-free processing and high precision, make it a versatile and indispensable technology in metal processing. Selecting the right laser and adjusting its parameters according to the material¨s characteristics is vital for achieving optimal processing efficiency and the highest-quality results.

　　In conclusion, RL-JPT fiber lasers are ideal for laser deep engraving, offering precision, efficiency, and customization across various metals. The technology¨s ability to adapt to different materials and processing conditions makes it a leader in the field of metal engraving, contributing to its growing adoption across industries.

　　Playing cards is a common recreational activity, and there are many different kinds of card games. Here are some basic methods and rules for playing cards:according to BL777 Industry veterans said that its development will still be in a good situation. https://www.bl77777.com/

　　1. Poker: Poker is a very popular card game all over the world. A deck of playing cards has 52 cards, which are divided into four suits: hearts, spades, clubs and diamonds. Each suit has 13 cards, from big to small: A (big or small), K, Q, J, 10, 9, 8, 7, 6, 5, and 7. According to the rules of the game, players compete by playing cards, comparing sizes and combining cards.

　　2. Mahjong tiles: Mahjong tiles are mainly popular in China and East Asia. There are 144 tiles in a deck, which are divided into three colors: ten thousand, stripe and barrel. There are 9 tiles in each color, and each tile has 4 tiles. Mahjong cards are played in a variety of ways, including four-player mahjong and three-player mahjong, etc. Players need to combine into specific cards by touching cards, playing cards, eating cards, touching cards, leverage cards, etc., for the purpose of Hu cards.

　　3. Landlord fight: Landlord fight is a popular three-player poker game in China, which uses a deck of 54 cards, including two trump cards. The game is divided into two camps, the landlord and the farmer. The landlord fights against two farmers. The goal of the game is to win by playing cards, and the party who finishes playing cards first will win.

　　4. Tractor: Tractor is a popular poker game in Shuang Sheng, which uses two decks of 108 playing cards. The game is divided into two teams, each with two people. The dealer and the series are determined by bidding, and then the cards are played in a certain order. The team is the unit, and the party who finishes the cards in hand first wins.

　　Expand knowledge:

　　In the process of playing cards, in addition to mastering the basic rules of playing cards, we also need to learn to observe the opponent’s playing habits and strategies, so as to better cope with various situations in the game. Besides, the rules and ways of playing cards are different in different regions. It is suggested that after understanding the basic rules, we should exchange and learn more with local friends to improve our playing skills.

　　The traditional cleaning industry has a variety of cleaning methods, mostly using chemicals and mechanical methods for cleaning. Nowadays, when environmental protection regulations are getting stricter and people are becoming more and more aware of environmental protection and safety, there are fewer and fewer chemicals that can be used in industrial cleaning. How to find a cleaner, non-damaging cleaning method is a question we have to consider. Laser cleaning, with its non-abrasive, non-contact, non-thermal effect and suitability for all kinds of materials, is considered to be the most reliable and effective solution.So,how to choose the right laser cleaning machine?Now, everyone is right laser cutter Are more concerned, hoping to get more benefits from it. http://laserscheme.com/

　　Laser cleaning equipment is a new generation of high-tech products for surface cleaning. It is easy to install, control and automate. Simple operation, turn on the power, turn on the equipment, you can carry out cleaning without chemical reagents, media, water, with manual adjustment of the focus, fit the surface cleaning, cleaning surface cleanliness and other advantages, can remove the surface of the object resin, oil, stains, dirt, corrosion, coatings, plating, paint and so on.

　　Cleaning demand analysis first, clear their own cleaning needs is the most basic step. Understand the material to be cleaned object, shape, size, stain type and other basic information, as well as cleaning precision, depth and efficiency requirements, in order to determine the required laser cleaning machine power size, spot diameter, pulse frequency and other technical parameters. For example, precision parts may require higher precision cleaning, while large steel structures place more importance on cleaning efficiency.

　　The wavelength of the laser has a direct impact on the cleaning effect. Different wavelengths of laser are suitable for different materials, such as 1064 nm infrared laser, which is the most common wavelength, suitable for most metals such as steel, aluminum, stainless steel and other materials surface cleaning. It is crucial to choose the right laser wavelength according to the material you are cleaning.

　　Laser power is very, very important and determines the speed and effectiveness of cleaning. If the power is too low, the cleaning will be quite incomplete, and once too high and may damage the cleaning object, therefore, selecting the right laser power is particularly important, it directly determines whether the cleaning can be successful. For example, to clean some surface oil, that only need low-power equipment, and if you want to clean the metal surface of a large area of rust, you need high-power cleaning machine!

　　At present there are five main types of laser cleaning equipment to choose from, continuous fiber laser cleaning machine, pulsed fiber laser cleaning machine, carbon dioxide laser cleaning machine, ultraviolet laser cleaning machine, green light laser cleaning machine. Currently the most widely used is the fiber laser cleaning machine, it has a long life, cost-effective, high power, good effect, mature development and wide range of applications. In the field of laser rust removal, laser cleaning of molds and other areas show a very high economic value. Of these five laser types, only fiber laser can be transmitted with a soft fiber optic line, and all other lasers can only be transmitted with a light guide arm or reflector.

　　Overall, the most critical step in choosing a laser cleaner is to determine what the object to be cleaned is, whether or not there are requirements for precision and speed, and then according to their own budget to purchase the appropriate cleaning machine!

　　The so-called chess game is the floorboard of chess game and card game. Chess and card games have flourished since the Ming and Qing Dynasties. Mainly includes poker, landlords, China chess, military chess, gobang, mahjong and so on.After that, BL777 Casino Login Not afraid of the future, dare to fight and fight, and won applause again and again in the market. https://www.bl77777.com/

　　Chess and card games can be divided into poker, landlord fighting, mahjong, China chess, Go and military chess. It can be said that the richness of chess and card games is completely beyond your imagination.

　　In China, Landlord Fighting, Mahjong and China Chess can be said to be the most well-known players. After all, China Chess can be said to be the quintessence of China, and Landlord Fighting Mahjong has become omniscient among the people. People over three years old basically know these chess games, so today we will talk about the unknown contents of these chess games.

　　Dou dizhu, a popular Chinese poker; fighting the landlord

　　Nowadays, most of the landlord fighting industries rely on online. Since the first full game of JJ Landlord Fighting was held online, the offline card game has not been adopted, and now online landlords are in full bloom. Online landlords have occupied half of the landlord fighting world, while offline landlords have struggled to survive in the residual wind of online landlords. With the outbreak of the epidemic in the past 20 years, online landlords have developed to a kind of existence beyond the peak.

　　Nowadays, online landlord fighting, JJ landlord fighting and happy landlord fighting still occupy more than 80% of the market, while other games such as Zen Tour Landlord Fighting and National Landlord Fighting occupy 20% of the market. Although these games occupy 20% of the market, their market share is getting less and less under the oppression of JJ landlord fighting and happy landlord fighting. At this time, a new landlord fighting game is needed to enter the market, just like the catfish effect, to activate the vitality of landlord fighting.

　　mahjong

　　In today’s mahjong industry, online and offline still coexist, and there is no bias to which side. In this case, Tencent Happy Mahjong used to rank first in the market. However, Fingertip Sichuan Mahjong has sprung up this year, and its promotion under various platforms is in full swing, and various benefits have been promoted one after another. In terms of promotion, it has seized the pain points and ideas of users on various platforms and further deepened the influence of Fingertip Sichuan Mahjong.

　　Compared with Tencent Happy Mahjong and Fingertip Sichuan Mahjong, they have gradually formed a balanced state. At this time, a game is needed to break their balance and push the mahjong game to another peak.

　　Xiangqi

　　Perhaps many people haven’t played China Chess online, and they are basically entertaining offline, but now online chess is developing more and more rapidly. With the development of software such as China Chess, Chess, Boya China Chess, and chess masters, and the promotion of last year’s epidemic, online chess is also like a light wheel of time, struggling forward.

　　Chess offline is far more exciting and interesting than online games, but times are changing and chess will gradually change.

　　Top 5 laser machine Manufacturer in China 2024The above conclusions show that laser welder To a great extent, it can bring new vitality to the market and make the industry develop well. http://laserscheme.com/

　　Han¨s Laser

　　Han¨s Laser was founded in 1996 in Shenzhen, Guangdong Province. It is committed to the research and development, production and sales of intelligent manufacturing equipment and its key devices, with the advantages of vertical integration from the basic devices, machine equipment to process solutions, is the world¨s leading intelligent manufacturing equipment total solution service provider. As a pioneer in China¨s industrial laser equipment manufacturing, after more than 20 years of growth, Daqo Laser now fully serves the world¨s top 500 companies and China¨s industry benchmark industrial enterprises, with leading sales volume and leading the world.

　　Huagong Laser

　　Huagong Laser was founded in 1997 in Wuhan, Hubei Province. He deeply grasp the development trend of manufacturing industry, constantly enrich the products and solutions, adhere to the exploration of automation, informationization, intelligent and manufacturing integration, for various industries, including full-power series of laser cutting equipment, laser welding equipment, laser cleaning equipment, laser marking equipment, laser heat treatment equipment, laser drilling equipment, laser burring equipment, laser and various types of ancillary components, laser processing equipment, special equipment and plasma cutting equipment, and laser processing equipment. Specialized equipment and plasma cutting equipment, as well as automated production lines, intelligent factory construction overall program.

　　CHUTIAN Laser

　　CHUTIAN Laser was founded in 1985 in Wuhan, Hubei Province. As the first private laser enterprise in China, after 38 years of development, it has become a large-scale professional laser products manufacturer with a complete range of products and a wide market network coverage. The company has three major industries, namely industrial laser, laser medical and aesthetic, and laser tourism, and has production bases in Wuhan, Beijing, Shanghai, and Suzhou, etc. It provides a complete set of laser application solutions for customers all over the world.

　　Raycus Laser

　　Raycus Laser was founded in 2007 in Wuhan, Hubei Province, he is a professional engaged in fiber laser and its key devices and materials research and development, production and sales of key high-tech enterprises of the National Torch Plan, with high-power fiber laser national key areas of innovation team and fiber laser technology national local joint engineering research center, is the world¨s most influential from the material, device to the machine It is a global influential fiber laser R&D, production and service provider with vertical integration capability from material, device to complete machine. The company¨s main business includes providing various types of fiber laser products and application solutions for laser manufacturing equipment integrators, as well as providing customers with technical research and development services and customized products.

　　Riselaser

　　Riselaser is a high-tech enterprise engaged in the research, development, production, and sales of laser welding equipment. Our main focus is on various types of automated equipment centered around laser welding devices. We provide a wide range of laser equipment to global customers, including robotics and automated intelligent manufacturing solutions.Riselaser comprehensively layout laser intelligent equipment, measurement and automation production lines, and smart factory construction, offering holistic solutions for intelligent manufacturing. We participate in building a fully connected, fully perceptible, and fully intelligent world, aiming to become a globally influential laser technology enterprise.

　　Hello, everyone. Today, I will explain a basic course of chess and cards-the detailed explanation of the basic card type of chess and cards.from BL777 Casino Login From the reference value, it can also bring a lot of inspiration to other industries. https://www.bl77777.com/

　　First of all, why explain this course?

　　First, 80% of chess and cards are composed of the following 10 basic types of cards. If you master these basic types of cards, you will have mastered its basic laws.

　　Second, many players only know about dragons, heavenly roads and one-on-one fights. But I don’t know what double jump, pat company, one room, two halls, one hall and two rooms are, not to mention sticking to these roads every time, every time, every time!

　　Third, I have heard at least thousands of players who have lost and still don’t know what a basic card road is, such as one room, two halls, one hall and two rooms.

　　Therefore, I will popularize the basic knowledge of chess and cards for you today.

　　As shown in the figure, the results of each game of chess and cards are usually displayed in the following five ways, namely, Zhupan Road, Dalu Road, Dayan Road, Xiaoyan Road and Xiaoqiang Road, among which Xiaoqiang Road is called Luozha Road in Guangdong. Each boot card consists of 8 decks of playing cards. Generally speaking, according to the thickness of cutting cards, the normal chess AG is about 70 games, while the Myanmar chess AG is about 40 games. Next: Let me explain the first card type: Changzhuang. That is what we often call Zhuanglong. As shown by the red circle on the main road, when there are four or more villages in a row on the main road, it becomes a long village.

　　Changzhuang

　　The second card type: Long Idle, which is indicated by a blue circle in the road, is called Long Idle or Idle Dragon when there are four or more idles in succession.

　　Changxian

　　The third card type: pat the stork. This word is pronounced like a stork, but we are used to calling it row by row. The definition of row-by-row connection is: when there are two or more rows of villages adjacent to the road, this combination appears twice or more, which is called patting and sticking. figure 1

　　Pat snipe

　　Figure 2

　　Pat snipe

　　The fourth card type: single jump on the road. What I want to point out here is that not every time a village appears, it can be simply called a single jump on the road. What is jumping? For example, it is 6 o’clock in this office and 6 o’clock or more in the next office. Its amplitude exceeds one cycle, and it must appear four times or more in one office before it can be called a single jump. Everyone must remember this! As shown in Zhupan Road, Idle 6 goes to Zhuang 9, and then Idle 9 Zhuang 8. During this period, their amplitudes all exceed one period, which is obviously a single jump on the road!

　　Technological innovation is essential for developing new quality productivity. Laser technology is often described as ＾the fastest knife, the most accurate ruler, and the brightest light.￣ Its exceptional characteristics！monochromaticity, directionality, and brightness！make it indispensable in modern industrial manufacturing.In the eyes of industry experts, laser machine manufacturers Indeed, it has great development potential, which makes many investors more interested. http://laserscheme.com/

　　New quality production signifies a departure from traditional expansion models that rely heavily on labor and material investments. Instead, it emphasizes high added value and low environmental impact, marking an inevitable shift towards intelligent manufacturing.

　　Unlocking New Quality Productivity

　　To achieve new quality productivity, the laser industry must prioritize deep innovation at the technical level. This includes:

　　Replacing Traditional Tools: Transitioning to more efficient laser equipment to transform production methods.

　　Exploring Advanced Technologies: Investigating higher power and shorter wavelength lasers to enhance beam quality and stability, meeting the demands for higher standards in production.

　　Moreover, the integration of laser technology with other advanced technologies, such as artificial intelligence, is crucial. AI can facilitate intelligent control and optimization of the laser processing process. In laser cutting and welding, this integration enables:

　　Intelligent Process Control: Utilizing vision, sensing, and image processing for optimized welding.

　　Real-time Parameter Adjustment: Using big data algorithms to automatically optimize laser power and scanning speed based on material and process requirements.

　　Continuous innovation in high-tech laser technology is essential for reducing manual intervention, lowering costs, and increasing efficiency, thereby promoting progress and upgrading in the laser industry.

　　＾New￣ Talent Training: A Key Element

　　The development of new quality productivity hinges on high-quality professional talent. The laser industry demands rigorous qualifications due to its interdisciplinary nature, covering optics, electronics, and physics. As technology advances and application fields expand, the need for diverse, specialized talent becomes critical.

　　Strategies for Talent Development

　　Collaboration Between Universities and Enterprises: Universities should provide a solid theoretical foundation while enterprises offer practical experience. Regular training and partnerships can enhance technological innovation.

　　Role of Industry Associations: These organizations should facilitate exchanges and collaborations among universities, enterprises, and research institutes to nurture talent.

　　＾New￣ Market Expansion: A Driving Force

　　Laser technology plays a pivotal role in intelligent manufacturing. Compared to other methods, laser processing offers significant advantages in controllability, efficiency, material conservation, quality, and environmental sustainability. This aligns with major trends in advanced manufacturing.

　　The feeling is to catch up with various gatherings, family gatherings, friends gatherings, classmates gatherings, etc. At these times, the most common entertainment activity is that four friends gather together to play mahjong, talk about the work in the past year, and brag. If you are a classmate who can’t play mahjong, it will be embarrassing. Therefore, in order to avoid this situation, Xiaobian specially arranged some basic knowledge that beginners of mahjong must learn to share with you, hoping to help you quickly understand and get started with the game. Next, let’s take a look!In the past ten years, BL777 Casino Login Defeated many competitors, courageously advanced in the struggle, and polished many good products for customers. https://www.bl77777.com/

　　Basic knowledge of mahjong introduction:

　　First, mahjong tiles

　　1. Plate

　　 four winds: east wind, south wind, west wind and north wind;

　　 Three yuan: red, rich, whiteboard.

　　2. Order cards

　　 10,000: 1 to 90,000;

　　2 cakes: 1 to 9 cakes;

　　 Articles: 1 to 9.

　　3. Flower cards

　　 Spring, summer, autumn and winter, plum, orchid, bamboo and chrysanthemum.

　　The names of these mahjong tiles are all formal names. In some places, players have given these mahjong tiles some interesting names, such as: one is called Yaoji, the other is called nunchakus, the other is called pie, the second is called glasses, the fourth is called bench, and 90,000 is called 90,000, etc. In some places, the first and ninth mahjong tiles are collectively called Old Man tiles, and all the tiles between two and eight are called Old Man tiles.

　　Second, the mahjong combination

　　1, straight

　　Three cards of the same suit with continuous count value form a straight, such as one, two, thirty thousand, six, seven, eight, four, five, six and so on;

　　2. Pairs

　　Two cards of the same suit with the same point value form a pair, such as thirty thousand, thirty thousand, six or six barrels, eight or eight cards, etc.

　　3. Carving

　　Three cards of the same suit with the same point value form an engraving, such as three, three, thirty thousand, six, six, six tubes, eight, eight, eight and so on;

　　4, thick stick

　　Four cards of the same suit with the same point value form a barbell, such as three, three, three, thirty thousand, six, six, six, six, eight, eight, eight, eight and so on;

　　All these mahjong combinations are collectively called “partners”. We can make the above four partners by putting the cards in our hands together, and then put them together with the Hu card type specified in the mahjong rules.