Keywords: Undirected-tree.svg example of an unrooted/undirected tree inner nodes marked black Own Nichtich Created with Graphviz Graphviz source <source lang dot > digraph G graph rankdir LR edge dir none node shape circle label node style filled color black a b c f a -> b -> c -> d a -> f -> g e -> c ; f -> h ; i -> f </source> Tree structures Images with Graphviz source code |