import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;


public class money {

	/**
	 * @param args
	 * @throws FileNotFoundException 
	 */
	public static void main(String[] args) throws FileNotFoundException {
		int[] suspects = new int[50];
		
		Scanner input = new Scanner(new File("money.in"));
		int numDataSets = input.nextInt();
		
		int numSuspects;
		int numTransactions;
		for(int i = 0; i < numDataSets; i++) {
			for(int z = 0; z < 50; z++)
				suspects[z] = 0;
			
			numSuspects = input.nextInt();
			numTransactions = input.nextInt();
			int x, y;
			for(int j = 0; j < numTransactions; j++) {
				suspects[input.nextInt()] += input.nextInt();
			}
			
			int highestTransaction = 0;
			int tempSuspect = 0;
			for(int k = 1; k < numSuspects + 1; k++) {
				if(suspects[k] > highestTransaction) {
					tempSuspect = k;
					highestTransaction = suspects[k];
				}	
			}
			
			boolean suspectFound = true;
			for(int l = 1; l < numSuspects + 1; l++) {
				if(tempSuspect != l){
					if(suspects[tempSuspect] <= 2 * suspects[l])
						suspectFound = false;
				}
			}
			
			System.out.println("Data Set " + (i + 1) + ":");
			if(suspectFound)
				System.out.println(tempSuspect);
			else
				System.out.println("No suspect.");
			
			if(i != numDataSets - 1)
				System.out.println();
		}
	}

}