/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner sc = new Scanner(System.in);
		int t = sc.nextInt();
		while(t-- >0){
			int n = sc.nextInt();
			int arr[] = new int[n], freq[] = new int[1002];
			for(int i=0;i<n;i++){
				arr[i] = sc.nextInt();
				freq[arr[i]-1]++;
			}
			boolean  ans = true;
			for(int i=0;i<1000;i++){
				if(freq[i]==0)continue;
				if(freq[i]>=2){
					freq[i+1]+=(freq[i]-2);
				}
				else {ans = false;
				break;
				}
 
			}
			System.out.println((ans)?"Yes":"No");
		}
		sc.close();
	}
}

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9
2
1 1
2
2 1
4
1 1 4 4
4
3 4 3 3
4
2 3 4 4
6
3 3 4 5 3 3
6
2 2 2 4 4 4
8
1 1 1 1 1 1 1 4
10
9 9 9 10 10 10 10 10 10 10