acyclic directed graph
The TopologicSort command returns a linear ordering of vertices of an acyclic digraph that is consistent with the arcs of the digraph. This means a vertex u precedes a vertex v if there is an arc from u to v. The output is a list.
DG ≔ Digraph⁡c,a,c,b,c,d,a,d,b,d,a,b:
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