public void AddEdge(int alpha, int beta, bool another = true)
{
if (Exists(alpha))
{
Nodes[alpha].AddNeighbour(beta);
}
else
{
Node node = this.AddVertex(alpha); //node is the created Alpha node
node.AddNeighbour(beta);
}
if (!IsOriented && another)
{
AddEdge(beta, alpha, false);
}
}