private DepthFirstSearch CreateDFS()
{
Graph graph = new Graph(8);
graph.AddEdge(0, 2);
graph.AddEdge(2, 1);
graph.AddEdge(2, 3);
graph.AddEdge(3, 4);
graph.AddEdge(3, 5);
graph.AddEdge(6, 7);
return(DepthFirstSearch.Create(graph, 5));
}