| adjacent_vertices | R Documentation | 
A vertex is adjacent is it is either a successor, or a predecessor.
adjacent_vertices(graph)
| graph | The graph. | 
A named list of character vectors, the adjacent vertices for each vertex.
Other simple queries: 
edges(),
order(),
vertices()
G <- graph(list(A = c("B", "C"), B = "C", C = "A"))
adjacent_vertices(G)
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