The most taboo numbers when choosing a license plate number should be: 4 and 5. There are no special requirements for letters. But it's not a requirement for driving, and I don't particularly care about it. I think the most important thing is to perform regular maintenance on the car after buying it. This means paying attention to safety when driving, obeying traffic rules, not rushing for time, keeping a clear mind at all times, and being an excellent driver.