Quatrain
Don du fu
Two orioles sing green willows,
A line of egrets rose into the sky.
The window contains autumn snow in Xiling,
Mambo Wu Dong Wan Li Ship.
Duality:
Two people against a line.
The oriole versus the egret
Green willows set off the sky.
Window to door
Xiling vs Wu Dong
Ship from Qianqiuxue to Wan Li