A labeled tree.
The labeled trees , , and .
The labeled trees and .
Application of the commutation relation ω → ω1 + ω2.
The labeled trees on the left and on the right.
The first step in the development of the labeled tree .
The second step in the development of the labeled tree .
The labeled tree where UV = VU + V 4.
The numbers b n, m of parents of type in .
The numbers a n, j of parents of type in .
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