Xiaoming's mother has three sons. The eldest brother is called heavy hair, the second one is called two hairs, and the third one is called what?

I heard a brain teaser before that Xiaoming's parents gave birth to three children. The eldest brother is called heavy hair, and the second is called two hairs. So what's the name of the third one? Many people will blurt out: "San Mao!" After causing the insiders to burst into laughter, I suddenly realized that I should be called Xiao Ming. Of course, there are countless similar jokes. This is inertial thinking, the natural way of thinking of human beings. It can be said that at any time and on any occasion, this kind of inertial thinking will play a role more or less, and so will the automobile field. The most typical example is to deal with the relationship between the hatchback version and the sedan version of the same car. Because it is estimated that more than 90% consumers in China will simply agree that the hatchback version is just a sedan version with a butt missing (and vice versa), and it is still the same model. Therefore, in the automobile market in China, the earliest appellation that continues to this day is "XXX hatchback version" or "XXX hatchback version".