An illusion diagram, 12 people change 13 people, what's the matter?

The first person on the left will lose a pinch of hair at one stage of gif.

Assuming that there is no such person in the next stage, the number of people in each row from left to right is 2, 3, 2, 3, 2, which is exactly *** 12. At that time, although there was actually this person, there were * * 13 people, but his hair was gone.

There are 12 people in the picture above, but the first one has a lock of hair on his head.

So what's the problem?

In other words, this tuft of hair is the shorter one in the first column on the right in the next picture. A lock of his hair is dispensable, and his next lock is provided by the black man in the front row.