But then there is the problem of needing distinct names for the
vertices of the line graph. Thus, line_graph doesn't handle multiple
edges correctly either.
Dave
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Solution?:
The beginning of the code for line_graph:
if self._directed:
G=DiGraph()
G.add_vertices(self.edges(labels=labels))
for v in self:
# Connect appropriate incident edges of the vertex v
G.add_edges([(e,f) for e in
