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Example

Graph <N_5, E>

E = {<0, 1>, <1, 0>, <0, 2>, <2, 0>, <1, 1>, <1, 2>,

<2, 1>, <3, 3>, <0, 4>, <4, 0>, <1, 4>, <4, 1>}

Draw single undirected edge instead of pair of directed edges.