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//Java code for immediate smaller problem on geeksforgeeks(School problem-array Section).
import java.util.*;
import java.lang.*;
import java.io.*;

class GFG 
{
	public static void main (String[] args) 
	{
		Scanner sc=new Scanner(System.in);
		int t=sc.nextInt();
		while(t-->0)
		{
		    int n=sc.nextInt();
		    int a[]=new int[n];
		    for(int i=0;i<n;i++)
		    {
		        a[i]=sc.nextInt();
		    }
		    for(int i=0;i<n-1;i++)
		    {
		        if(a[i+1]<a[i])
		        System.out.print(a[i+1]+" ");
		        else
		        System.out.print(-1+" ");
		    }
		    System.out.print(-1);
		    System.out.println();
		}
	}
}