Figure 20

Deriving the two subcubes $Q_4^{n_u}$ and $Q_6^{n_p}$. A structure gives rise to rearrange its compatible sequences into unpaired and paired segment. The former is a sequence over the original alphabet A, U, G, C and for the latter we derive a sequence over the alphabet of base pairs, (A, U), (U, A), (G, U), (U, G), (G, C), (C, G)