A hierarchy is the opposite of a network. *Opposite?*
In graph theory, a "network" would be just a graph (you may want it to be a connected graph.)
A "hierarchy" would be something like a "directed acyclic graph" (directed tree)
or just a graph with specific constraints.

See NetworkVsHierarchy for discussion.

CategoryCategory, CategoryNetwork, CategoryClassification

See NetworkVsHierarchy for discussion.

CategoryCategory, CategoryNetwork, CategoryClassification

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