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'Pesto' as test case
<graphviz dot right>
digraph G {
bgcolor = "grey93"; #rankdir="LR"; subgraph ingredients { graph [shape=circle]; node [shape=circle]; basil; "pine nuts"; parmesan; garlic; "olive oil"; i-001; i-002; 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>