Figure 5.

Trees within networks. The sets $\mathcal{T}(N_1)=\{T_1^1,T_1^2,T_1^3,T_1^4\}$ and $\mathcal{T}(N_2)=\{T_2^1,T_2^2,T_2^3,T_2^4\}$ of all eight trees induced by the two networks N₁ and N₂, respectively, in Figure 2.