dotSrc = `
digraph {
graph [pad="0.212,0.055" bgcolor=lightgray]
node [style=filled]
a [fillcolor="#d62728" pos="0,0!"]
b [fillcolor="#1f77b4" pos="0,1!"]
c [fillcolor="#2ca02c" pos="2,2!"]
d [fillcolor="#ff7f0e" pos="-1,0!"]
a -> b
a -> c
a -> d
}
`