void CreateProperLayeredGraph()
{
IEnumerable <IntEdge> edges = CreatePathEdgesOnIntGraph();
var nodeCount = Math.Max(intGraph.NodeCount, BasicGraph <Node, IntEdge> .VertexCount(edges));
var baseGraph = new BasicGraph <Node, IntEdge>(edges, nodeCount)
{
Nodes = intGraph.Nodes
};
ProperLayeredGraph = new ProperLayeredGraph(baseGraph);
}
