#import "@preview/fletcher:0.6.0" as fletcher: diagram, node, edge

#let nodes = ("A", "B", "C", "D", "E", "F", "G")
#let edges = (
  (3, 2),
  (4, 1),
  (1, 4),
  (0, 4),
  (3, 0),
  (5, 6),
  (6, 5),
)

#diagram({
  for (i, n) in nodes.enumerate() {
    let θ = 90deg - i*360deg/nodes.len()
    node((θ, 18mm), n, stroke: 0.5pt, name: str(i))
  }
  for (from, to) in edges {
    let bend = if (to, from) in edges { 10deg } else { 0deg }
    // refer to nodes by label, e.g., <1>
    edge(label(str(from)), label(str(to)), "-|>", bend: bend)
  }
})