For example, the fourth grade, the little finger 1, 2, 3, the fourth grade refers to thousands, and the fourth grade refers to 1000 ~ 3999 yuan. The first opening is specific, that is to say, the range of primary four is determined to be around 1000.

In the same way, the little five is divided into three parts, the little finger 1, 2, 3, five fingers, and the little finger: 10000 ~ 39999 yuan. The third opening is specific, that is to say, the range of five levels is determined to be around 30 thousand.