s/EachVertex/Vertices/
s/EachEdgeIncidentTo/IncidentTo/
s/EachArcFrom/ArcsFrom/
s/EachArcTo/ArcsTo/
s/EachEdge/Edges/
s/EachAdjacentTo/AdjacentTo/
s/EachSuccessorOf/SuccessorsOf/
s/EachPredecessorOf/PredecessorsOf/
s/EachArc/Arcs/
Shorten enumerators, its just better.