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// Next Greater Element

import java.util.*;
import java.lang.*;
import java.io.*;

class GFG {
    
	public static void main (String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int t = Integer.parseInt(br.readLine().trim());
		while(t-->0){
		    int n = Integer.parseInt(br.readLine().trim());
		    String inputLine[] = br.readLine().trim().split(" ");
		    long[] arr = new long[n];
		    for(int i=0; i<n; i++)arr[i]=Long.parseLong(inputLine[i]);
		    long[] res = new Solution().nextLargerElement(arr, n);
		    for (int i = 0; i < n; i++) 
		        System.out.print(res[i] + " ");
		    System.out.println();
		}
	}
}





class Solution
{
    //Function to find the next greater element for each element of the array.
    public static long[] nextLargerElement(long[] arr, int n)
    { 
        // Your code here
        long[] ans=new long[n];
        Arrays.fill(ans,-1);
        Stack<Integer> st=new Stack<>();
        
        for(int i=0;i<n;i++){
            while(st.size()>0 && arr[i]>arr[st.peek()]){
                int tbf=st.pop();
                ans[tbf]=arr[i];
            }
            st.push(i);
        }
        return ans;
    } 
}