#import "@preview/fletcher:0.6.0" as fletcher: cetz, 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),
)

#cetz.canvas({
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 { 12deg } else { 0deg }
// refer to nodes by label, e.g., <1>
edge(label(str(from)), label(str(to)), "-|>", bend: bend)
}
})