3917.sagews

G = Graph({"a":["b","e"],"b":["a","c","e"],"c":["b","d"],"d":["c","e"],"e":["a","b","d"]})

G

Graph on 5 vertices

G.vertices()

['a', 'b', 'c', 'd', 'e']

G.edges(labels=false)

[('a', 'b'), ('a', 'e'), ('b', 'c'), ('b', 'e'), ('c', 'd'), ('d', 'e')]

G.neighbors("a")

['b', 'e']