The first layer is "one, one" in bold type No.3;

The second layer is "(2)", italics are bold, and the font number is four;

The third layer is "1." , the song style is bold, and the four fonts are small;

The fourth layer is "(1)", which is bold, with font number five;

The fifth floor is "①", with bold song style and font number six.

It should be noted that different institutions or organizations may have different requirements for the format of grade labels, so it should be adjusted according to the specific situation when writing.