ntinue

                color = palette.get(color_id)

                if isinstance(group, VertexSeq):
                    group = [vertex.index for vertex in group]
                if not hasattr(group, &#34;__iter__&#34;):
                    raise TypeError(&#34;group membership list must be iterable&#34;)

                # Get the vertex indices that constitute the convex hull
                hull = [group[i] for i in convex_hull([layout[idx] for idx in group])]

                # Calculate the prefer