Warning: unknown attribute key 'd3' in a <data> tag, ignoring attribute The directed graph: Vertices: 6 Edges: 7 Directed: 0 0 1 0 2 1 3 2 3 2 4 3 5 4 5 Warning: unknown attribute key 'd3' in a <data> tag, ignoring attribute The undirected graph: Vertices: 6 Edges: 7 Directed: 0 0 1 0 2 1 3 2 3 2 4 3 5 4 5