samehead value are aimed at the same point on the head type: string, default: ""
This has no effect on loops.
Prior to Graphviz 8.0.1, each node can have at most 5 unique samehead values.
See limitation.
See also sametail.
Note: dot only.
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Licensed under the Eclipse Public License 1.0.
https://www.graphviz.org/docs/attrs/samehead/