using System;

using System.Collections.Generic;

​

public struct Node

{

    public String id;

    public List<Relation> relations;

    public Node(String id)

    {

        this.id = id;

        this.relations = new List<Relation>();

    }

}

​

public struct Relation

{

    public int id;

    public int fromPort;

    public Node from;

    public int toPort;

    public Node to;

    public Relation(int id, int fromPort, Node from, int toPort, Node to)

    {

        this.id = id;

        this.fromPort = fromPort;

        this.from = from;

        this.toPort = toPort;

        this.to = to;

    }

}

public class Program

{

    public static void Main()

    {

        List<Node> nodes = new List<Node>();

        List<Relation> relations = new List<Relation>();

        var nA = new Node("A");

        var nB = new Node("B");

        var nC = new Node("C");

        var nD = new Node("D");

        var nE = new Node("E");

        var nF = new Node("F");

        var r1 = new Relation(1, 1, nA, 1, nB);

        var r2 = new Relation(2, 2, nB, 1, nC);

        var r3 = new Relation(3, 2, nC, 1, nD);

        var r4 = new Relation(4, 2, nD, 1, nF);

        var r5 = new Relation(5, 2, nD, 1, nE);

        var r6 = new Relation(6, 2, nC, 1, nF);

        nA.relations.Add(r1);

        nB.relations.Add(r1);

        nB.relations.Add(r2);

        nC.relations.Add(r2);

        nC.relations.Add(r3);

        nD.relations.Add(r3);

        nD.relations.Add(r4);

        nF.relations.Add(r4);

        nD.relations.Add(r5);

        nE.relations.Add(r5);

        nC.relations.Add(r6);

        nF.relations.Add(r6);

        nodes.Add(nA);

        nodes.Add(nB);

        nodes.Add(nC);

        nodes.Add(nD);

        nodes.Add(nE);

        nodes.Add(nF);

        relations.Add(r1);

        relations.Add(r2);

        relations.Add(r3);

        relations.Add(r4);

        relations.Add(r5);

        relations.Add(r6);

        Dictionary<int, List<Node>> networks = new Dictionary<int, List<Node>>(); // I-IV: Can also be a nested list

        Dictionary<int, List<Node>> redundantNetworks = new Dictionary<int, List<Node>>();  // V: Can also be a nested list

        //Calculation for the networks here...

        Console.WriteLine(nodes.Count.ToString()+" Nodes and "+relations.Count.ToString()+" Relations");

    }

}