diagonal = d3.linkHorizontal().x(d => d.y).y(d => d.x)
tree = d3.tree().nodeSize([dx, dy])
data_line = FileAttachment("qom.json").json()
stratify = d3.stratify()
.id(d => d["name"])
.parentId(d => d["parent"])
data = stratify(data_line)
dx = 10
dy = width / 6
margin = ({top: 10, right: 120, bottom: 10, left: 40})
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