Imposing additional restrictions to the geometry can ease the finding of viable geometries, and this is what is applied in the current version of CoNTub: Forcing the tubes connected to be of the same kind, and forcing an additional C3 symmetry, an automated way to construct the geometry can be found. However, even with these restrictions, the possibilities are still infinite. Therefore, a way to estimate the viability of the junction, even before constructing it, had to be developed. Given that non-hexagonal rings