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copied!<p>Sure, here's the code to draw the graph in your Question (and which is shown rendered by dot, below).</p> <pre><code>digraph g { rankdir = TB; bgcolor = white; edge[arrowsize=.7, color=black]; node[shape=box, color=black] {rank=same; a, b, c}; {rank=same; d, e, f}; {rank=same; g, h}; {rank=same; i, j, k}; d[color=blue; shape=circle]; e[color=blue; shape=circle]; k[color=blue; shape=circle]; a -> d; b -> d; b -> e; c -> e; d -> g; e -> h; d -> i; d -> j; j -> k; h -> k; k -> f; } </code></pre> <p><br/></p> <ol> <li><p>the first line <strong><em>digraph</em></strong> is for <em>directed graph</em> (for graphs in which the edges have a direction).</p></li> <li><p>The fourth and fifth lies above set default attributes for edges and nodes, respectively. In other words, once you've done this, you only need to style (include attribues + values) nodes (or edges) which you want to style differently than the default values. You can have more than one node "template" by creating <em>subgraphs</em>, or discrete groups nodes (see the dot Manual).</p></li> <li><p><em>rank=same</em> allows you to specifiy a group of nodes having the same vertical position (provided <em>rankdir</em> is set to <em>TB</em>, which meant "top-to-bottom").</p></li> <li><p>By default, the node name (e.g., a, b, c in my graph) is used as the node's label. If you don't want this shown in the rendered graph, just set <em>label=""</em></p></li> </ol> <p><img src="https://i.stack.imgur.com/SaWTa.png" alt="enter image description here"></p>

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