rankdir
Direction to draw directed graphs (one rank at a time)
"TB""LR""BT""RL"
Corresponding to directed graphs drawn from top to bottom, from left to right, from bottom to top, and from right to left, respectively.
Attributes
rankdir is a valid type for:
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attr-types/rankdir/