import java.io.*;
import java.util.*;

public class Solution {

     private final static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        
        
         int testcase;
         int nnodes;
         int nedges;
        int startnode;
        int x,y;
        
     testcase = scanner.nextInt(); 
      System.out.println(testcase);
     if(testcase<1 data-blogger-escaped-testcase="">20)
         System.exit(0);
        
        
        int[][] arrayval = new int[1000][3];
//Input        
      for(int i=0;i1000)
             System.exit(0);
          
          System.out.println(nnodes);
          nedges = scanner.nextInt();
          
          if(nedges<1 data-blogger-escaped-nedges="">((nnodes*(nnodes-1))/2))
              System.exit(0);
         
          for(int j=0;jnnodes)
                    System.exit(0);
              
              y = scanner.nextInt();
                if(y<1 data-blogger-escaped-y="">nnodes)
                    System.exit(0);
              
              arrayval[j][1] = x;
              arrayval[j][2] = y;
          }
          //Edges
          startnode = scanner.nextInt();
          if(startnode<1 data-blogger-escaped-startnode="">nnodes)
             System.exit(0);
       
      }
        
        
            
    }
}