add-vertex ( vertex edges graph -- )
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remove-vertex ( vertex edges graph -- )

Vocabulary
graphs

Inputs

vertex	an object
edges	a sequence
graph	an assoc mapping vertices to hash-set of edges

Outputs
None

Word description
Adds a vertex to a directed graph, with edges as the outward edges from the vertex.

Side effects
Modifies graph

Definition

USING: graphs.private kernel sequences sets ;

IN: graphs

: add-vertex ( vertex edges graph -- )
    [ nest adjoin ] curry with each ; inline