Problem: You found a useless array a of 2n positive integers. You have realized that you actually don't need this array, so you decided to throw out all elements of a.

It could have been an easy task, but it turned out that you should follow some rules: 

  1. In the beginning, you select any positive integer x.
  2. Then you do the following operation n times: 
    * select two elements of array with sum equals x; 
    * remove them from a and replace x with maximum of that two numbers. 



For example, if initially a = [3, 5, 1, 2], you can select x = 6. Then you can select the second and the third elements of a with sum 5 + 1 = 6 and throw them out. After this operation, x equals 5 and there are two elements in array: 3 and 2. You can throw them out on the next operation.

Note, that you choose x before the start and can't change it as you want between the operations.

Determine how should you behave to throw out all elements of a.

Input

The first line contains a single integer t (1 ≤ t ≤ 1000) — the number of test cases.

The first line of each test case contains the single integer n (1 ≤ n ≤ 1000).

The second line of each test case contains 2n integers a_1, a_2, ..., a_{2n} (1 ≤ a_i ≤ 10^6) — the initial array a.

It is guaranteed that the total sum of n over all test cases doesn't exceed 1000.

Output

For each test case in the first line print YES if it is possible to throw out all elements of the array and NO otherwise.

If it is possible to throw out all elements, print the initial value of x you've chosen. Print description of n operations next. For each operation, print the pair of integers you remove.

Example

Input


4
2
3 5 1 2
3
1 1 8 8 64 64
2
1 1 2 4
5
1 2 3 4 5 6 7 14 3 11


Output


YES
6
1 5
2 3
NO
NO
YES
21
14 7
3 11
5 6
2 4
3 1

Note

The first test case was described in the statement.

In the second and third test cases, we can show that it is impossible to throw out all elements of array a.

Solution (in JAVA):

Solution:
//package div3;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.*;

public class board
{
    static class FastReader
    {
        BufferedReader br;
        StringTokenizer st;

        public FastReader()
        {
            br = new BufferedReader(new
                    InputStreamReader(System.in));
        }

        String next()
        {
            while (st == null || !st.hasMoreElements())
            {
                try
                {
                    st = new StringTokenizer(br.readLine());
                }
                catch (IOException  e)
                {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt()
        {
            return Integer.parseInt(next());
        }

        long nextLong()
        {
            return Long.parseLong(next());
        }

        double nextDouble()
        {
            return Double.parseDouble(next());
        }

        String nextLine()
        {
            String str = "";
            try
            {
                str = br.readLine();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            return str;
        }
    }


    static long gcd(long a, long b)
    {
        if (a == 0)
            return b;
        return gcd(b % a, a);
    }

    // method to return LCM of two numbers
    static long lcm(long a, long b)
    {
        return (a / gcd(a, b)) * b;
    }
    static void sieveOfEratosthenes(int n)
    {
        // Create a boolean array "prime[0..n]" and initialize
        // all entries it as true. A value in prime[i] will
        // finally be false if i is Not a prime, else true.

        for(int i=0;i<n;i++)
            prime[i] = true;

        for(int p = 2; p*p <=n; p++)
        {
            // If prime[p] is not changed, then it is a prime
            if(prime[p] == true)
            {
                // Update all multiples of p
                for(int i = p*p; i <= n; i += p)
                    prime[i] = false;
            }
        }


    }
    static boolean[] prime;
    static class Tiger{
        List<Integer> l;
        int index;
        int o;
        Tiger(List<Integer> l,int i,int o){
            this.l = l; this.index = i; this.o = o;
        }
        public String toString() {
            return "Key: " + l.toString() + ", Value: " + index;
        }
    }
    public static void main(String[] args)
    {
        FastReader sc=new FastReader();
        PrintWriter out = new PrintWriter(System.out);
        int t = sc.nextInt();

        while(t-->0){
            int n = sc.nextInt();
            int[] a = new int[2*n];
            for(int i=0;i<2*n;i++) a[i] = sc.nextInt();
            Arrays.sort(a);
            Map<Integer,Tiger> map = new HashMap<>();
            for(int i=0;i<a.length;i++){
                Tiger tiger;
                if(map.containsKey(a[i])){
                     tiger = map.get(a[i]); tiger.l.add(i); tiger.index++; tiger.o++; map.put(a[i],tiger);
                }
                else{
                    List<Integer> list = new ArrayList<>(); list.add(i);
                    tiger = new Tiger(list,0,0); map.put(a[i],tiger);
                }
            }
            //System.out.println(map.toString());
            boolean good = false;
            StringBuilder ans = new StringBuilder("YES"+"\n");
            for(int take=0;take<2*n-1;take++){
                StringBuilder str = new StringBuilder();
                boolean[] visited = new boolean[2*n];
                //Map<Integer,TreeSet<Integer>> map1 = (HashMap) ((HashMap<Integer, TreeSet<Integer>>) map).clone();
                for(int key:map.keySet()){
                    Tiger tiger = map.get(key);
                    tiger.index = tiger.o;

                }
                //System.out.println(map1.toString());
                visited[take] = true;
                visited[2*n-1] = true;
                int sum = a[2*n-1]+a[take];
                int max = a[2*n-1];

                Tiger temp = map.get(max);
                temp.index -=1;
                map.put(max,temp);

                str.append(sum +"\n");
                str.append(a[2*n-1]+" "+a[take] + "\n");
                boolean ok = true;
                for(int i=2*n-2;i>=0;i--){
                    if(visited[i] || max == a[i]) continue;
                    if(map.containsKey(max-a[i]) && map.get(a[i]).index >= 0 && map.get(max-a[i]).index >= 0){
                        if(2*a[i] == max){
                            if(map.get(a[i]).index < 1) continue;
                        }
                        //visited[i] = true;
                        List<Integer> indices1 = map.get(a[i]).l;
                        List<Integer> indices2 = map.get(max-a[i]).l;
                        int lastPos1 = map.get(a[i]).index;
                        int lastPos2 = map.get(max-a[i]).index;
                        str.append(a[i] +" "+ (max - a[i]) +"\n");
                        if(a[i] == max-a[i]) lastPos2--;
                        visited[indices1.get(lastPos1)] = true;
                        visited[indices2.get(lastPos2)] = true;



                        Tiger tiger = map.get(a[i]);
                        tiger.index = lastPos1-1;
                        map.put(a[i],tiger);



                        Tiger tiger1 = map.get(max-a[i]);
                        tiger1.index = lastPos2-1;
                        map.put(max-a[i],tiger1);

                        max = Math.max(a[i],max-a[i]);

                    }
                    else{
                        ok = false; break;
                    }
                }
                //out.println(Arrays.toString(visited));
                for(int i=0;i<visited.length;i++) if(!visited[i]){
                    ok = false; break;
                }
                if(ok){
                    good = true;
                    ans.append(str);
                    break;
                }



            }
            if(good){
                //if(n == 1000) out.println(ans.substring(6400));
                out.print(ans.toString());
            }
            else out.println("NO");

        }
        out.close();
    }


}