/* package codechef; // 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. */
public class Codechef
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		Scanner s = new Scanner(System.in);
		int t = s.nextInt();
		while (t-- != 0){
		    int n = s.nextInt();
		    int arr[] = new int[n];
		    for (int i = 0; i < n; i++){
		        arr[i] = s.nextInt();
		    }
		    if (arr[0] + arr[1] > arr[n - 1]){
		        System.out.println(-1);
		    }
		    else{
		        System.out.println(1 + " " + 2 + " " + n);
		    }
		}
	}
}
