Question on a DAG graph

I can't even get a simple DAG graph working.
If anyone could even post up a link to one - I'd appreciate it.

# Install the packages dagitty and ggdag
# install.packages("dagitty")
library("dagitty")

dag01 <- dagitty("dag{Pollution <- Growth -> Employment}")
coordinates(dag01) <- list(
  x = c(Pollution = 1, Growth = 2, Employment = 3),
  y = c(Pollution = 2, Growth = 1, Employment = 2))
plot(dag01)

There are some examples here: Causal Inference In Statistics: A Companion for R Users

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