using System;

public class Program

{

    public static void Main()

    {

        int [,] tunnels = {{5,1}, {3,2}, {7,1}, {5,2},{7,4},{6,5},{6,4},{7,5},{2,1},{5,3}};

        //for (int i=0; i<tunnels.Length/2; i++) { for (int j=0; j<2; j++) {Console.WriteLine(tunnels[i,j]);}}

        //Console.WriteLine(tunnels[9,1]);

        int [,] matrix = new int [10,10];

        for (int i = 0; i<tunnels.Length/2; i++) {

         int x = tunnels[i,0];

         int y = tunnels[i,1];

         matrix [x,y]=1;

         matrix [y,x]=1;

        }

        //Console.WriteLine(matrix [1,5]);

        for (int k=0; k<10;k++) {for (int m=0; m<10

    }

}