public void AddNeighbour(Subregion neighbour)
{
if (NeighbouringSubregions.Contains(neighbour))
{
return;
}
NeighbouringSubregions.Add(neighbour);
neighbour.AddNeighbour(this);
}
public void RemoveNeighbour(Subregion neighbour)
{
NeighbouringSubregions.Remove(neighbour);
neighbour.NeighbouringSubregions.Remove(this);
}