import java.util.*;
public class Main
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        while(t-->0)
        {
            int n = sc.nextInt();
            int m = sc.nextInt();
            List<Integer> res = new ArrayList<>();
            int[] a = new int[n];
            int[] b = new int[m];
            for(int i=0;i<n;i++)
            {
                a[i]=sc.nextInt();
            }
            for(int j=0;j<m;j++)
            {
                b[j]=sc.nextInt();
            }
            Arrays.sort(b);
            int d[] = new int[m];
            for(int i=0;i<m;i++)
            {
                d[i]=b[m-1-i];
            }
            int i=0,j=0;
            while(i<n && j<m)
            {
                if(a[i]>d[j])
                {
                    res.add(a[i]);
                    i++;
                }
                else
                {
                    res.add(d[j]);
                    j++;
                }
            }
            while(i<n) 
                res.add(a[i++]);
            while(j<m)
                res.add(d[j++]);
            for(int x : res)
                System.out.print(x+" ");
            System.out.println();
        }
    }
}

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7
2 1
6 4
5
5 5
1 7 2 4 5
5 4 1 2 7
1 9
7
1 2 3 4 5 6 7 8 9
3 2
1 3 5
2 4
10 5
1 9 2 3 8 1 4 7 2 9
7 8 5 4 6
2 1
2 2
1
6 1
1 1 1 1 1 1
777