When such a tree is uniquely determined by the set of black and white degrees of its vertices, it is called unitree, and the corresponding DZ-pair is defined over ℚ.

This displays one side of the binary in all its Platonic-Descartesean arrogance.

[…] ; merchant ships from Min province (Fujian) are called “bird ships” […]

Whoopee-do, man. Congrats! That basically just described an Iguana.