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Two trees are edge-disjoint if there is no edge appearing in both of them. Let G be a graph with 2 edge-disjoint spanning trees. What

Two trees are edge-disjoint if there is no edge appearing in both of them.

Let G be a graph with 2 edge-disjoint spanning trees. What is the least number of vertices, n' , that G can have? Give an example of a graph on n' vertices which has 2 edge-disjoint spanning trees.

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