Do ancient poems count as duality?

Many ancient poems are dual, which is the basic requirement for writing ancient poems.

For example, Du Fu's seven-character quatrains:

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.

Wang Zhihuan's five-character quatrains:

The mountains covered the white sun,

The ocean drained the golden river.

But you expanded your horizons by 300 miles,

Walk up a flight of stairs.