A poem of seven words and four lines.

Four-character poems are not necessarily all four-character poems, but mainly four-character poems. For example:

Han Dynasty: Cao Cao's "Short Songs" and Cao Cao's "Short Songs"

Viewing the sea in Han Dynasty: fourteen poems of Cao Cao's "Giving Scholars to Join the Army", Wei and Jin Dynasties: Ji Kang.

The leading trilogy of the Northern and Southern Dynasties: Anonymous.

Guan Hu, Ge Tan, Juan Er, Mu Zhi, Yao Tao, Rabbit Hu, Guo Hu, Han Guang, Rufen, Quechao, Cai Wei, Cao Cao, Cai Ping, Gan Tang, Lamb, Yin and Yan.