The usual three numbers.

A set of practices that have been used and have not changed. The original or old set. More refers to unchanging customs or working methods. Xu Maoyong's "chicken ribs": "There is no talk about state affairs at the banquet, and there is no old-fashioned banquet, just some lyric poems." Chapter 2 of Du Pengcheng's Defending Yan 'an: "In the past, my work was like this. I like to use that old and simple method. "