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'Pesto' as test case
![how to make pesto... how to make pesto...](https://live.staticflickr.com/7325/10454814174_799db8aa0b_b.jpg)
<graphviz dot right>
digraph G {
bgcolor = "grey93"; #rankdir="LR"; subgraph ingredients { graph [shape=circle]; node [shape=circle]; basil; "pine nuts"; parmesan; garlic; "olive oil"; "(intermediate 1 - blended)"; "(intermediate 2 - grated parmesan)"; pesto } subgraph transitions { node [shape=rect]; blend; grate; mix; } basil -> blend; garlic -> blend; "pine nuts" -> blend -> "(intermediate 1 - blended)" -> mix; parmesan -> grate -> "(intermediate 2 - grated parmesan)" -> mix; "olive oil" -> mix; mix -> pesto;
}
</graphviz>