import java.util.*; 
  
public 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[] arr = new int[n];
	  for (int i = 0;i < n;i++)
		{
			arr[i] = sc.nextInt();
		}
		if(arr[0]+arr[1]>arr[n-1])
		System.out.println("-1");
		else
		System.out.println("1"+" "+"2"+" "+n);
      }
    }
} 